<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:a35432ce-9668-4f50-88bd-1e081dccf1d9,g:3cb92f34-4083-4776-9777-e3e599179518-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="whg-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS" xlink:type="extended" id="i384e68ff80fe409ab412c2123d6824ab_CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_f27499dc-84d1-4d7b-8074-728b996559ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_f27499dc-84d1-4d7b-8074-728b996559ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_1a7166b1-1752-4e3a-b7b1-88a269486068" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_1a7166b1-1752-4e3a-b7b1-88a269486068" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_73761a7a-ecca-4a4a-8f6c-5dd1587c7f55" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_73761a7a-ecca-4a4a-8f6c-5dd1587c7f55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_ce9adb69-4851-4c34-aa37-c82a92c7ed2e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_ce9adb69-4851-4c34-aa37-c82a92c7ed2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_2b5e4aeb-9b51-4aae-b30b-810efbe2b942" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_2b5e4aeb-9b51-4aae-b30b-810efbe2b942" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_16d4fe71-8898-4bd7-b122-e8c973dab854" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_16d4fe71-8898-4bd7-b122-e8c973dab854" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_e6c1d498-5e62-427d-adad-c908e09508e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_GainLossOnInvestments_e6c1d498-5e62-427d-adad-c908e09508e4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable_9be583fe-f453-4c86-94ed-d03b85ce7ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable_9be583fe-f453-4c86-94ed-d03b85ce7ca0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized_dca8272d-5aae-40e3-935f-07ecf59736bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized_dca8272d-5aae-40e3-935f-07ecf59736bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_3f4e700e-0e59-4acb-8595-647d8b28142f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_3f4e700e-0e59-4acb-8595-647d8b28142f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_5d7d2988-8b1a-4c6e-b54d-8e570c257398" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_ProfitLoss_5d7d2988-8b1a-4c6e-b54d-8e570c257398" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_21dc34a3-6e6b-44a6-9d5f-2bae10e55fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7c7a81d4-aab0-432b-9d7b-138cd71226b9" xlink:to="loc_us-gaap_StatementTable_21dc34a3-6e6b-44a6-9d5f-2bae10e55fcb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_006210e3-2c70-4334-a5ae-c2af5651bc88" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_21dc34a3-6e6b-44a6-9d5f-2bae10e55fcb" xlink:to="loc_srt_ProductOrServiceAxis_006210e3-2c70-4334-a5ae-c2af5651bc88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_006210e3-2c70-4334-a5ae-c2af5651bc88_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_006210e3-2c70-4334-a5ae-c2af5651bc88" xlink:to="loc_srt_ProductsAndServicesDomain_006210e3-2c70-4334-a5ae-c2af5651bc88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5af6c4fc-bebf-4147-87ec-344fce1b4fe6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_006210e3-2c70-4334-a5ae-c2af5651bc88" xlink:to="loc_srt_ProductsAndServicesDomain_5af6c4fc-bebf-4147-87ec-344fce1b4fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetManagement1Member_aa5b9abf-8109-47ce-a690-6e96b2d05f24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetManagement1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5af6c4fc-bebf-4147-87ec-344fce1b4fe6" xlink:to="loc_us-gaap_AssetManagement1Member_aa5b9abf-8109-47ce-a690-6e96b2d05f24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentPerformanceMember_bbb61328-dd36-42f4-a671-c5f25eef1b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentPerformanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5af6c4fc-bebf-4147-87ec-344fce1b4fe6" xlink:to="loc_us-gaap_InvestmentPerformanceMember_bbb61328-dd36-42f4-a671-c5f25eef1b3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_35166fbf-3e78-4768-be9c-59b7402b3a29" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiduciaryAndTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5af6c4fc-bebf-4147-87ec-344fce1b4fe6" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_35166fbf-3e78-4768-be9c-59b7402b3a29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustPerformanceBasedFeesMember_344148ca-bcae-427e-83cf-0ec1a0342593" xlink:href="whg-20230331.xsd#whg_TrustPerformanceBasedFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5af6c4fc-bebf-4147-87ec-344fce1b4fe6" xlink:to="loc_whg_TrustPerformanceBasedFeesMember_344148ca-bcae-427e-83cf-0ec1a0342593" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_21d865cd-2de8-4688-8e89-c826d8939795" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_21dc34a3-6e6b-44a6-9d5f-2bae10e55fcb" xlink:to="loc_srt_StatementScenarioAxis_21d865cd-2de8-4688-8e89-c826d8939795" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_21d865cd-2de8-4688-8e89-c826d8939795_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_21d865cd-2de8-4688-8e89-c826d8939795" xlink:to="loc_srt_ScenarioUnspecifiedDomain_21d865cd-2de8-4688-8e89-c826d8939795_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_dca41e8e-a864-4152-a9a0-5d6daf737744" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_21d865cd-2de8-4688-8e89-c826d8939795" xlink:to="loc_srt_ScenarioUnspecifiedDomain_dca41e8e-a864-4152-a9a0-5d6daf737744" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="whg-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="extended" id="ib3c98faa98db44c5a2e0653fd00e254c_CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_18956c62-30cb-4656-b445-c07b708d9ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_StockholdersEquity_18956c62-30cb-4656-b445-c07b708d9ca6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_55919b51-bb51-41f9-b765-27134fb8f496" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_55919b51-bb51-41f9-b765-27134fb8f496" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_8253858d-f994-4893-b817-5903c061bc85" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_NetIncomeLoss_8253858d-f994-4893-b817-5903c061bc85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_0b0bb6ae-7dc8-467f-8cf6-1713ae44e111" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_0b0bb6ae-7dc8-467f-8cf6-1713ae44e111" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_95f7efdb-0968-4f01-a622-29af13088635" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_95f7efdb-0968-4f01-a622-29af13088635" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_4ef445ed-b763-47fe-9766-66e04338d0c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_4ef445ed-b763-47fe-9766-66e04338d0c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_0b192286-6bd2-49db-98df-0da34bc47401" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_0b192286-6bd2-49db-98df-0da34bc47401" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_721bbdc5-c03b-4a39-a5f9-2af1eb355b15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_DividendsCommonStock_721bbdc5-c03b-4a39-a5f9-2af1eb355b15" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_02336260-3dbd-4540-aa73-0323d1577ce5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_02336260-3dbd-4540-aa73-0323d1577ce5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockAwardForfeituresDividends_6e34112f-984a-453b-8f5f-326ce58b66ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockAwardForfeituresDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_RestrictedStockAwardForfeituresDividends_6e34112f-984a-453b-8f5f-326ce58b66ae" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_5a1c7c63-5846-4858-8b3a-a501ac8e654f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_5a1c7c63-5846-4858-8b3a-a501ac8e654f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_508a21bf-ab82-4c1f-96a2-6ffdc08f434f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_508a21bf-ab82-4c1f-96a2-6ffdc08f434f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TreasuryStockSharesAcquiredEmployeeStockPlan_796f1b86-6dbf-4474-b027-5668984884b6" xlink:href="whg-20230331.xsd#whg_TreasuryStockSharesAcquiredEmployeeStockPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_whg_TreasuryStockSharesAcquiredEmployeeStockPlan_796f1b86-6dbf-4474-b027-5668984884b6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings_aaf8f69c-2944-4474-b4bd-ddc4595e9863" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings_aaf8f69c-2944-4474-b4bd-ddc4595e9863" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fbe53da4-22aa-4c44-8552-c88ce4df719c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_dfe865a9-df7f-4251-8ace-734ba88b938c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_7afd0346-bbfa-4fac-a2b9-8d42dab48968" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_ProfitLoss_7afd0346-bbfa-4fac-a2b9-8d42dab48968" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_ba297f00-312b-4970-b38a-0e1fd9e7e660" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_ba297f00-312b-4970-b38a-0e1fd9e7e660" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_f2993316-ffd7-4c9b-8dea-f3822736dbb4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_f2993316-ffd7-4c9b-8dea-f3822736dbb4" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings_5dad779e-1d0f-4d91-a12e-102c16c60952" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings_5dad779e-1d0f-4d91-a12e-102c16c60952" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_f8da1508-4a2e-4023-a836-f7942a2ee6df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_f8da1508-4a2e-4023-a836-f7942a2ee6df" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_70029af1-559d-408c-8683-da2e62f4945a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_70029af1-559d-408c-8683-da2e62f4945a" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ReturnOfCapital_d0e6fd8a-096a-42b5-9b1a-20793ff6e4b7" xlink:href="whg-20230331.xsd#whg_ReturnOfCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_whg_ReturnOfCapital_d0e6fd8a-096a-42b5-9b1a-20793ff6e4b7" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_266734b8-cfc3-48f4-abf6-037d1a5afaf2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_266734b8-cfc3-48f4-abf6-037d1a5afaf2" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TreasuryStockValueAcquiredCostMethodEmployeeStockPlan_bc6c6e28-8216-4d03-970b-957cc050ee38" xlink:href="whg-20230331.xsd#whg_TreasuryStockValueAcquiredCostMethodEmployeeStockPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_whg_TreasuryStockValueAcquiredCostMethodEmployeeStockPlan_bc6c6e28-8216-4d03-970b-957cc050ee38" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1d5b2c44-10fe-4210-adff-3dcf97d853ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_06189bdf-6549-4959-88b8-a7f21eed942f" xlink:to="loc_us-gaap_StatementTable_1d5b2c44-10fe-4210-adff-3dcf97d853ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_f71ba1ed-7607-4c18-b900-71004cba68ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1d5b2c44-10fe-4210-adff-3dcf97d853ef" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_f71ba1ed-7607-4c18-b900-71004cba68ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f71ba1ed-7607-4c18-b900-71004cba68ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f71ba1ed-7607-4c18-b900-71004cba68ef" xlink:to="loc_us-gaap_EquityComponentDomain_f71ba1ed-7607-4c18-b900-71004cba68ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f71ba1ed-7607-4c18-b900-71004cba68ef" xlink:to="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_5b719b40-9e36-466f-82e5-ece9695b3fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:to="loc_us-gaap_CommonStockMember_5b719b40-9e36-466f-82e5-ece9695b3fa0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_8177bacf-0194-4202-8822-049171c55a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_8177bacf-0194-4202-8822-049171c55a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_ba01f81d-2d70-4259-b575-e4ac822012e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:to="loc_us-gaap_TreasuryStockMember_ba01f81d-2d70-4259-b575-e4ac822012e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_0b12caa7-d449-49c3-8d35-a71c599c7291" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_0b12caa7-d449-49c3-8d35-a71c599c7291" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_a0c76178-213f-45b6-b24a-19f1aba1a06f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_020bb25e-2282-4064-9186-1668f9d9b74b" xlink:to="loc_us-gaap_RetainedEarningsMember_a0c76178-213f-45b6-b24a-19f1aba1a06f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/SUBSEQUENTEVENTS" xlink:type="simple" xlink:href="whg-20230331.xsd#SUBSEQUENTEVENTS"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SUBSEQUENTEVENTS" xlink:type="extended" id="ibc506ec34f4045c7a658765a34477e99_SUBSEQUENTEVENTS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_e7e09972-85e1-41aa-8dae-46c13a758f90" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_8c16a333-3283-42ab-99ff-47cc5a6a92f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_e7e09972-85e1-41aa-8dae-46c13a758f90" xlink:to="loc_us-gaap_SubsequentEventTable_8c16a333-3283-42ab-99ff-47cc5a6a92f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_44cb7f76-ea5a-45d4-bf49-27676c8138a5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_8c16a333-3283-42ab-99ff-47cc5a6a92f0" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_44cb7f76-ea5a-45d4-bf49-27676c8138a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_44cb7f76-ea5a-45d4-bf49-27676c8138a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_44cb7f76-ea5a-45d4-bf49-27676c8138a5" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_44cb7f76-ea5a-45d4-bf49-27676c8138a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_ebe5f7a7-73a5-48a9-9cfc-9217cf1547f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_44cb7f76-ea5a-45d4-bf49-27676c8138a5" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_ebe5f7a7-73a5-48a9-9cfc-9217cf1547f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_63333b22-4d67-4fc9-96a0-d96030e01c17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_ebe5f7a7-73a5-48a9-9cfc-9217cf1547f1" xlink:to="loc_us-gaap_SubsequentEventMember_63333b22-4d67-4fc9-96a0-d96030e01c17" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONTables" xlink:type="simple" xlink:href="whg-20230331.xsd#LONGTERMINCENTIVECOMPENSATIONTables"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONTables" xlink:type="extended" id="i4e840794a2b5499d8dde053b9f88f758_LONGTERMINCENTIVECOMPENSATIONTables">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ade4c7e2-d630-4c6f-8123-2709557c1000" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock_3171ace7-5a1e-4362-9dcd-cee5560cd191" xlink:href="whg-20230331.xsd#whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ade4c7e2-d630-4c6f-8123-2709557c1000" xlink:to="loc_whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock_3171ace7-5a1e-4362-9dcd-cee5560cd191" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_f1accdcd-26b1-47fa-b6ed-a66c16c7d281" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ade4c7e2-d630-4c6f-8123-2709557c1000" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_f1accdcd-26b1-47fa-b6ed-a66c16c7d281" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_cbb38ffc-41f8-4e9c-8c48-de91096812a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ade4c7e2-d630-4c6f-8123-2709557c1000" xlink:to="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_cbb38ffc-41f8-4e9c-8c48-de91096812a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock_9f42e9b7-8bfb-4834-a11b-baa04b076a42" xlink:href="whg-20230331.xsd#whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ade4c7e2-d630-4c6f-8123-2709557c1000" xlink:to="loc_whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock_9f42e9b7-8bfb-4834-a11b-baa04b076a42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0d316be0-5d8b-4479-84c9-44338d457058" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ade4c7e2-d630-4c6f-8123-2709557c1000" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0d316be0-5d8b-4479-84c9-44338d457058" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_3cb252ca-b4f1-4574-ae0b-7ba8f1a6fffc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0d316be0-5d8b-4479-84c9-44338d457058" xlink:to="loc_us-gaap_AwardTypeAxis_3cb252ca-b4f1-4574-ae0b-7ba8f1a6fffc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3cb252ca-b4f1-4574-ae0b-7ba8f1a6fffc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_3cb252ca-b4f1-4574-ae0b-7ba8f1a6fffc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3cb252ca-b4f1-4574-ae0b-7ba8f1a6fffc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3e02ed73-db5d-4feb-9e46-77ca8964fe64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_3cb252ca-b4f1-4574-ae0b-7ba8f1a6fffc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3e02ed73-db5d-4feb-9e46-77ca8964fe64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedStockSubjectOnlyToServiceConditionMember_67ae4800-89f0-4376-b87c-001fbd648775" xlink:href="whg-20230331.xsd#whg_RestrictedStockSubjectOnlyToServiceConditionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3e02ed73-db5d-4feb-9e46-77ca8964fe64" xlink:to="loc_whg_RestrictedStockSubjectOnlyToServiceConditionMember_67ae4800-89f0-4376-b87c-001fbd648775" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_85682ae9-3eda-4dd0-9df1-8eebbef3dbd1" xlink:href="whg-20230331.xsd#whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3e02ed73-db5d-4feb-9e46-77ca8964fe64" xlink:to="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_85682ae9-3eda-4dd0-9df1-8eebbef3dbd1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/EARNINGSPERSHAREDetailsTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#EARNINGSPERSHAREDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EARNINGSPERSHAREDetailsTextual" xlink:type="extended" id="id61af4f366804254a1e54e50877b66b0_EARNINGSPERSHAREDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_5268596e-5a6a-4f8f-b804-fbda87f077be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_cb2f782d-c908-42e4-9aed-b300b528f6df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_5268596e-5a6a-4f8f-b804-fbda87f077be" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_cb2f782d-c908-42e4-9aed-b300b528f6df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9eb98de8-b90a-4a21-bc1b-322aaa99adb8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_5268596e-5a6a-4f8f-b804-fbda87f077be" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9eb98de8-b90a-4a21-bc1b-322aaa99adb8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_19996a1d-b340-4a57-811e-ba8432e8a980" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9eb98de8-b90a-4a21-bc1b-322aaa99adb8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_19996a1d-b340-4a57-811e-ba8432e8a980" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19996a1d-b340-4a57-811e-ba8432e8a980_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_19996a1d-b340-4a57-811e-ba8432e8a980" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_19996a1d-b340-4a57-811e-ba8432e8a980_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d22e1425-40e1-407e-9924-f52d4146e8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_19996a1d-b340-4a57-811e-ba8432e8a980" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d22e1425-40e1-407e-9924-f52d4146e8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_ba6660aa-d1f5-44d5-88fc-e56b4058eb9e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d22e1425-40e1-407e-9924-f52d4146e8a7" xlink:to="loc_us-gaap_RestrictedStockMember_ba6660aa-d1f5-44d5-88fc-e56b4058eb9e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/INVESTMENTSDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#INVESTMENTSDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/INVESTMENTSDetails" xlink:type="extended" id="i635b7740d34f47f9a21d7cf2850d3d4f_INVESTMENTSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_f4928196-61d5-404a-a6a9-0ca347c75342" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_f4928196-61d5-404a-a6a9-0ca347c75342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiGainLossAbstract_736705e3-f263-459a-89a2-b5d471f47bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNiGainLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquitySecuritiesFvNiGainLossAbstract_736705e3-f263-459a-89a2-b5d471f47bcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_ef4379a1-c074-4ac1-b41f-e968c257abf0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_ef4379a1-c074-4ac1-b41f-e968c257abf0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedloss_b67e7934-20b1-4026-90da-0937c0d61de0" xlink:href="whg-20230331.xsd#whg_Investmentscarriedatfairvalueunrealizedloss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedloss_b67e7934-20b1-4026-90da-0937c0d61de0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_c021ef53-1f81-4e71-9aaa-b6728f1b049e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_c021ef53-1f81-4e71-9aaa-b6728f1b049e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedgain_e865a745-4b7b-4678-9d62-7441d38d28b3" xlink:href="whg-20230331.xsd#whg_Investmentscarriedatfairvalueunrealizedgain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedgain_e865a745-4b7b-4678-9d62-7441d38d28b3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_aeb6da66-ed97-4358-9379-215f5a1288fb" xlink:href="whg-20230331.xsd#whg_UnrealizedGainsLossesOnPrivateInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_aeb6da66-ed97-4358-9379-215f5a1288fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostMethodInvestments_4e0cfe91-6c0b-4af4-ae37-fbe7ce52fc8f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_CostMethodInvestments_4e0cfe91-6c0b-4af4-ae37-fbe7ce52fc8f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_d4b74bc6-912b-4b41-a97a-b59e5e0a014c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecuritiesDebtAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_d4b74bc6-912b-4b41-a97a-b59e5e0a014c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingUnrealizedGain_36d44208-26ef-421e-8471-008a5b44e9cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtSecuritiesTradingUnrealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_DebtSecuritiesTradingUnrealizedGain_36d44208-26ef-421e-8471-008a5b44e9cb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingUnrealizedLoss_b3bf39cf-2973-48b3-a790-f978ce17268c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtSecuritiesTradingUnrealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_DebtSecuritiesTradingUnrealizedLoss_b3bf39cf-2973-48b3-a790-f978ce17268c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_d026a228-c23f-4291-b818-4348b346dd0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_TradingSecuritiesDebt_d026a228-c23f-4291-b818-4348b346dd0f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCost_5b69eb0c-2569-4278-a0c9-7c4294548c50" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNiCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCost_5b69eb0c-2569-4278-a0c9-7c4294548c50" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_54ba1263-02ad-416c-b7bd-4bd202fa9826" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_54ba1263-02ad-416c-b7bd-4bd202fa9826" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedLoss_9283f94f-b8d4-4566-90cd-1abdbb6b7664" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedLoss_9283f94f-b8d4-4566-90cd-1abdbb6b7664" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_ddebcadc-11f4-4667-954d-ec3979d409b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_ddebcadc-11f4-4667-954d-ec3979d409b4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingAndEquitySecuritiesFvNiCost_f31ab48e-f014-49ef-a785-b993ff2853a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtSecuritiesTradingAndEquitySecuritiesFvNiCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_DebtSecuritiesTradingAndEquitySecuritiesFvNiCost_f31ab48e-f014-49ef-a785-b993ff2853a1" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedGain_8ed98ab5-15a6-421f-af92-f9737b1bab42" xlink:href="whg-20230331.xsd#whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedGain_8ed98ab5-15a6-421f-af92-f9737b1bab42" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedLoss_0b4ba09f-2fe5-4df8-91ec-6dbc464dba87" xlink:href="whg-20230331.xsd#whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedLoss_0b4ba09f-2fe5-4df8-91ec-6dbc464dba87" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_7551d9ac-4bc8-418d-a23a-ab24b66dda30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_TradingSecurities_7551d9ac-4bc8-418d-a23a-ab24b66dda30" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_696d2ba5-50fe-48f2-a5d7-20d23077e26b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_LongTermInvestments_696d2ba5-50fe-48f2-a5d7-20d23077e26b" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_2b776f03-1f2a-41c4-9437-2f82f5b320e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_2b776f03-1f2a-41c4-9437-2f82f5b320e0" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_LongtermInvestmentsCarriedatFairValue_f299c10c-c82c-457c-85c1-15ec8aeb0b9e" xlink:href="whg-20230331.xsd#whg_LongtermInvestmentsCarriedatFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_LongtermInvestmentsCarriedatFairValue_f299c10c-c82c-457c-85c1-15ec8aeb0b9e" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_LongTermInvestmentsCarriedAtFairValueUsingNAV_9bbe792b-593d-4e96-8482-485deefba74d" xlink:href="whg-20230331.xsd#whg_LongTermInvestmentsCarriedAtFairValueUsingNAV"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_whg_LongTermInvestmentsCarriedAtFairValueUsingNAV_9bbe792b-593d-4e96-8482-485deefba74d" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_1e0f57d4-7a54-4778-8062-af001c114871" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_EquityMethodInvestments_1e0f57d4-7a54-4778-8062-af001c114871" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5e005286-b4c2-4df4-8473-a2950e9dd7dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_888994f4-eb36-47ff-851c-cebb51d1938c" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5e005286-b4c2-4df4-8473-a2950e9dd7dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_e3c416f3-084d-43ff-a615-53b5732bb280" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5e005286-b4c2-4df4-8473-a2950e9dd7dd" xlink:to="loc_us-gaap_InvestmentTypeAxis_e3c416f3-084d-43ff-a615-53b5732bb280" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_e3c416f3-084d-43ff-a615-53b5732bb280_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_e3c416f3-084d-43ff-a615-53b5732bb280" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_e3c416f3-084d-43ff-a615-53b5732bb280_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_e3c416f3-084d-43ff-a615-53b5732bb280" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_36431b8d-8c6e-40cb-b0a3-e3298f32dd69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_36431b8d-8c6e-40cb-b0a3-e3298f32dd69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_94531752-4f38-4d28-b9ca-54dc4d3eaa18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_us-gaap_MoneyMarketFundsMember_94531752-4f38-4d28-b9ca-54dc4d3eaa18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityFundsMember_7c7c07cb-8ef7-4b30-bc25-9cd03128a8e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_us-gaap_EquityFundsMember_7c7c07cb-8ef7-4b30-bc25-9cd03128a8e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_6bb7a4a9-b9b6-4130-a271-7c24f6152ed1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_us-gaap_EquitySecuritiesMember_6bb7a4a9-b9b6-4130-a271-7c24f6152ed1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UsGaap_EquitySecuritiesMemberMember_d8cc553c-5c22-46bb-bae6-37a2c8a59da4" xlink:href="whg-20230331.xsd#whg_UsGaap_EquitySecuritiesMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_whg_UsGaap_EquitySecuritiesMemberMember_d8cc553c-5c22-46bb-bae6-37a2c8a59da4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_d6b4514d-de3c-4de9-a819-0ec1d8b059c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrivateEquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_us-gaap_PrivateEquityFundsMember_d6b4514d-de3c-4de9-a819-0ec1d8b059c4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_70c50981-d60d-47d0-be7e-7efa9df96fbf" xlink:href="whg-20230331.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_30defe78-092d-4c04-9f76-943c81f18e77" xlink:to="loc_whg_PrivateEquityInvestmentsMember_70c50981-d60d-47d0-be7e-7efa9df96fbf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_fc7902af-58dd-4179-bc83-9b097f6a56c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_5e005286-b4c2-4df4-8473-a2950e9dd7dd" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_fc7902af-58dd-4179-bc83-9b097f6a56c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_fc7902af-58dd-4179-bc83-9b097f6a56c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_fc7902af-58dd-4179-bc83-9b097f6a56c3" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_fc7902af-58dd-4179-bc83-9b097f6a56c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_fc7902af-58dd-4179-bc83-9b097f6a56c3" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ZarvonaEnergyFundGPLPDomain_edbbf0ee-4f5e-491e-8005-7415ab29ec1d" xlink:href="whg-20230331.xsd#whg_ZarvonaEnergyFundGPLPDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:to="loc_whg_ZarvonaEnergyFundGPLPDomain_edbbf0ee-4f5e-491e-8005-7415ab29ec1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ZarvonaEnergyFundIIALPDomain_162696c7-2c1f-4a59-95c1-92ccaf618fa6" xlink:href="whg-20230331.xsd#whg_ZarvonaEnergyFundIIALPDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:to="loc_whg_ZarvonaEnergyFundIIALPDomain_162696c7-2c1f-4a59-95c1-92ccaf618fa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_BroadmarkAssetManagementLLCDomain_bc6cc001-b0fc-4738-8494-3dbbf90fc214" xlink:href="whg-20230331.xsd#whg_BroadmarkAssetManagementLLCDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:to="loc_whg_BroadmarkAssetManagementLLCDomain_bc6cc001-b0fc-4738-8494-3dbbf90fc214" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_SalientMLPTotalReturnFundLPDomain_904c2218-18e8-421a-8ac8-1bf766898e8f" xlink:href="whg-20230331.xsd#whg_SalientMLPTotalReturnFundLPDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:to="loc_whg_SalientMLPTotalReturnFundLPDomain_904c2218-18e8-421a-8ac8-1bf766898e8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_SalientMLPTotalReturnTEFundLPDomain_7650fe46-4276-4d57-bd61-bd6d99094e1b" xlink:href="whg-20230331.xsd#whg_SalientMLPTotalReturnTEFundLPDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:to="loc_whg_SalientMLPTotalReturnTEFundLPDomain_7650fe46-4276-4d57-bd61-bd6d99094e1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TotalMember_030b7e2c-3f9e-4bdc-b69a-adc24a6980e7" xlink:href="whg-20230331.xsd#whg_TotalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_095921bb-1ac4-49c2-b84a-494a662814ea" xlink:to="loc_whg_TotalMember_030b7e2c-3f9e-4bdc-b69a-adc24a6980e7" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/INVESTMENTSDetailsTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#INVESTMENTSDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/INVESTMENTSDetailsTextual" xlink:type="extended" id="ie87a8b5a757c42d6ad4a7ac15a888d66_INVESTMENTSDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_998d222d-10a1-4b2d-bc1b-3ee87afe72c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_us-gaap_LongTermInvestments_998d222d-10a1-4b2d-bc1b-3ee87afe72c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_c9406aa0-f878-44b0-a817-d4bcfa7118cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_us-gaap_TradingSecurities_c9406aa0-f878-44b0-a817-d4bcfa7118cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainOnSecurities_9a86dca0-12a0-4072-a9c9-538f9494d1c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrealizedGainOnSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_us-gaap_UnrealizedGainOnSecurities_9a86dca0-12a0-4072-a9c9-538f9494d1c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_e4625e99-fbdd-4647-a7a2-7c841e2ed9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_us-gaap_GainLossOnInvestments_e4625e99-fbdd-4647-a7a2-7c841e2ed9eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedgain_e7e327f6-ad41-435a-b9be-2afd706a88ac" xlink:href="whg-20230331.xsd#whg_Investmentscarriedatfairvalueunrealizedgain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedgain_e7e327f6-ad41-435a-b9be-2afd706a88ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_9b90b795-87d5-4f7e-8407-fc329816e4be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecuritiesDebtAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_9b90b795-87d5-4f7e-8407-fc329816e4be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_75594e58-b4e6-421d-87d9-048d1a5e1dc1" xlink:href="whg-20230331.xsd#whg_UnrealizedGainsLossesOnPrivateInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_75594e58-b4e6-421d-87d9-048d1a5e1dc1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_73ab7ad6-1b38-4c01-a451-43ea43242d74" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_0a6ef1e6-41a4-44aa-a1d2-08a7604da8f2" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_73ab7ad6-1b38-4c01-a451-43ea43242d74" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_bef33a67-5f01-4e72-8524-f9ac5812cb09" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_73ab7ad6-1b38-4c01-a451-43ea43242d74" xlink:to="loc_srt_ConsolidatedEntitiesAxis_bef33a67-5f01-4e72-8524-f9ac5812cb09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_bef33a67-5f01-4e72-8524-f9ac5812cb09_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_bef33a67-5f01-4e72-8524-f9ac5812cb09" xlink:to="loc_srt_ConsolidatedEntitiesDomain_bef33a67-5f01-4e72-8524-f9ac5812cb09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_ae5a2902-9cd1-4e7e-ae91-54679a49549d" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_bef33a67-5f01-4e72-8524-f9ac5812cb09" xlink:to="loc_srt_ConsolidatedEntitiesDomain_ae5a2902-9cd1-4e7e-ae91-54679a49549d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_VariableInterestEntityMember_6c1a1912-d65e-43a2-886b-881c6cff260d" xlink:href="whg-20230331.xsd#whg_VariableInterestEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_ae5a2902-9cd1-4e7e-ae91-54679a49549d" xlink:to="loc_whg_VariableInterestEntityMember_6c1a1912-d65e-43a2-886b-881c6cff260d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_7e8bf314-a491-4c85-b22e-423ac209c8b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_73ab7ad6-1b38-4c01-a451-43ea43242d74" xlink:to="loc_us-gaap_InvestmentTypeAxis_7e8bf314-a491-4c85-b22e-423ac209c8b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_7e8bf314-a491-4c85-b22e-423ac209c8b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_7e8bf314-a491-4c85-b22e-423ac209c8b9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_7e8bf314-a491-4c85-b22e-423ac209c8b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_a340f581-5326-4cc2-b8fd-d26494d08bcf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_7e8bf314-a491-4c85-b22e-423ac209c8b9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_a340f581-5326-4cc2-b8fd-d26494d08bcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UsGaap_EquitySecuritiesMemberMember_a4643987-edc0-4448-9e98-d39c6c1ca9de" xlink:href="whg-20230331.xsd#whg_UsGaap_EquitySecuritiesMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_a340f581-5326-4cc2-b8fd-d26494d08bcf" xlink:to="loc_whg_UsGaap_EquitySecuritiesMemberMember_a4643987-edc0-4448-9e98-d39c6c1ca9de" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/FAIRVALUEMEASUREMENTSDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#FAIRVALUEMEASUREMENTSDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/FAIRVALUEMEASUREMENTSDetails" xlink:type="extended" id="ib4e6d82bba404181b6b8e0db79836041_FAIRVALUEMEASUREMENTSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_a6e26df5-07f8-4baa-8c57-f76c28e95ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:to="loc_us-gaap_TradingSecuritiesDebt_a6e26df5-07f8-4baa-8c57-f76c28e95ee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_1babcf92-31af-4245-94bb-9335d5ded12c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_1babcf92-31af-4245-94bb-9335d5ded12c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_14163c9f-e61f-467d-b534-a12b6e7bc816" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:to="loc_us-gaap_TradingSecurities_14163c9f-e61f-467d-b534-a12b6e7bc816" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityFairValueByFairValueHierarchyLevelExtensibleList_5b2d3449-c592-49de-80d4-56e8d23de4e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityFairValueByFairValueHierarchyLevelExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityFairValueByFairValueHierarchyLevelExtensibleList_5b2d3449-c592-49de-80d4-56e8d23de4e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_1880d989-4363-4bac-bb92-48422c6fcd4d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_3f1e0fc4-d452-443d-b7a5-3ed6c32a000a" xlink:to="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_1880d989-4363-4bac-bb92-48422c6fcd4d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4915e933-7070-4e2a-bec6-3e0266bbacc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4915e933-7070-4e2a-bec6-3e0266bbacc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_49c4e178-768b-4653-9e93-3d8c50bdf5c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4915e933-7070-4e2a-bec6-3e0266bbacc0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_49c4e178-768b-4653-9e93-3d8c50bdf5c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_4abc7230-c042-475b-b101-c7a1a0269e51" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4915e933-7070-4e2a-bec6-3e0266bbacc0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_4abc7230-c042-475b-b101-c7a1a0269e51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_67e3fec6-96bc-4cbd-8e33-c1eddfcaf25a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease_0ebee723-b8d2-43e0-9fb0-abe109c6c0d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4915e933-7070-4e2a-bec6-3e0266bbacc0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease_0ebee723-b8d2-43e0-9fb0-abe109c6c0d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_FairValueInputsAbstract_bd98cd35-ee97-4322-bba5-89a4824f2562" xlink:href="whg-20230331.xsd#whg_FairValueInputsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_FairValueInputsAbstract_bd98cd35-ee97-4322-bba5-89a4824f2562" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_3a3d298e-9673-44a0-a019-0f1ebd41d6db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsSensitivityAnalysisDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_3a3d298e-9673-44a0-a019-0f1ebd41d6db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputBookValueMultipleMinimum_616973ef-cb8c-44ba-81d8-a5f9ecf1f3d2" xlink:href="whg-20230331.xsd#whg_UnobservableInputBookValueMultipleMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputBookValueMultipleMinimum_616973ef-cb8c-44ba-81d8-a5f9ecf1f3d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputBookValueMultipleMaximum_1e21916c-a087-45d6-8094-3a9313f429f5" xlink:href="whg-20230331.xsd#whg_UnobservableInputBookValueMultipleMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputBookValueMultipleMaximum_1e21916c-a087-45d6-8094-3a9313f429f5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputBookValueMultipleWeightedAverage_777208e2-7d01-495d-8383-8e249a86ea65" xlink:href="whg-20230331.xsd#whg_UnobservableInputBookValueMultipleWeightedAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputBookValueMultipleWeightedAverage_777208e2-7d01-495d-8383-8e249a86ea65" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_070239a9-ce35-403c-a28a-8b6105f9b4b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_LongTermInvestments_070239a9-ce35-403c-a28a-8b6105f9b4b1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_8ccde9c6-ce1d-4e95-b285-e0ea9b0946e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_8ccde9c6-ce1d-4e95-b285-e0ea9b0946e5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_babc33fa-3437-434b-b1dd-1b6324872251" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_babc33fa-3437-434b-b1dd-1b6324872251" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputRevenueRetentionDiscountRateMaximum_565231a9-d302-476b-906f-86f2ecf77ac4" xlink:href="whg-20230331.xsd#whg_UnobservableInputRevenueRetentionDiscountRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputRevenueRetentionDiscountRateMaximum_565231a9-d302-476b-906f-86f2ecf77ac4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputRevenueRetentionDiscountRateWeightedAverage_a11458b7-2120-4803-ae9b-7feb3340f1a0" xlink:href="whg-20230331.xsd#whg_UnobservableInputRevenueRetentionDiscountRateWeightedAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputRevenueRetentionDiscountRateWeightedAverage_a11458b7-2120-4803-ae9b-7feb3340f1a0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputRevenueRetentionDiscountRateMinimum_a5ddcfcb-f0de-4cab-9239-388b1c4fc284" xlink:href="whg-20230331.xsd#whg_UnobservableInputRevenueRetentionDiscountRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputRevenueRetentionDiscountRateMinimum_a5ddcfcb-f0de-4cab-9239-388b1c4fc284" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputRevenueRetentionVolatilityWeightedAverage_e1f23d19-15e1-46c0-aa17-a5f454129ebe" xlink:href="whg-20230331.xsd#whg_UnobservableInputRevenueRetentionVolatilityWeightedAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputRevenueRetentionVolatilityWeightedAverage_e1f23d19-15e1-46c0-aa17-a5f454129ebe" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputRevenueRetentionVolatilityMaximum_5e015abf-ae4d-4665-b5b0-88b3e7c29215" xlink:href="whg-20230331.xsd#whg_UnobservableInputRevenueRetentionVolatilityMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputRevenueRetentionVolatilityMaximum_5e015abf-ae4d-4665-b5b0-88b3e7c29215" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputRevenueRetentionVolatilityMinimum_73532619-9b03-4571-95fb-b583a30d75cf" xlink:href="whg-20230331.xsd#whg_UnobservableInputRevenueRetentionVolatilityMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputRevenueRetentionVolatilityMinimum_73532619-9b03-4571-95fb-b583a30d75cf" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputGrowthDiscountRateWeightedAverage_4d902a8f-cb21-46b0-a93f-b7148a9fa8a5" xlink:href="whg-20230331.xsd#whg_UnobservableInputGrowthDiscountRateWeightedAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputGrowthDiscountRateWeightedAverage_4d902a8f-cb21-46b0-a93f-b7148a9fa8a5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputGrowthDiscountRateMaximum_763acd68-34c7-4dcb-9f01-9c04af92e1b5" xlink:href="whg-20230331.xsd#whg_UnobservableInputGrowthDiscountRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputGrowthDiscountRateMaximum_763acd68-34c7-4dcb-9f01-9c04af92e1b5" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputGrowthDiscountRateMinimum_00983da4-9a2c-49ce-9374-7376aed339aa" xlink:href="whg-20230331.xsd#whg_UnobservableInputGrowthDiscountRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputGrowthDiscountRateMinimum_00983da4-9a2c-49ce-9374-7376aed339aa" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputGrowthVolatilityWeightedAverage_39575111-8798-4279-989d-7924ff5cce0e" xlink:href="whg-20230331.xsd#whg_UnobservableInputGrowthVolatilityWeightedAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputGrowthVolatilityWeightedAverage_39575111-8798-4279-989d-7924ff5cce0e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputGrowthVolatilityMaximum_f51cdbd9-4365-49f5-b08c-6d9e329926b6" xlink:href="whg-20230331.xsd#whg_UnobservableInputGrowthVolatilityMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputGrowthVolatilityMaximum_f51cdbd9-4365-49f5-b08c-6d9e329926b6" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputGrowthVolatilityMinimum_2e1d946f-ed5c-4288-ab13-b442c227cad9" xlink:href="whg-20230331.xsd#whg_UnobservableInputGrowthVolatilityMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_whg_UnobservableInputGrowthVolatilityMinimum_2e1d946f-ed5c-4288-ab13-b442c227cad9" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_748649db-9942-470e-bacd-d2b1761e3e5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2ca4f94c-e37a-4c73-8be9-6e7335fe1ad9" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_748649db-9942-470e-bacd-d2b1761e3e5e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_fd634124-8b98-40f0-9c6d-60fc6a4e5d1d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_748649db-9942-470e-bacd-d2b1761e3e5e" xlink:to="loc_us-gaap_InvestmentTypeAxis_fd634124-8b98-40f0-9c6d-60fc6a4e5d1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_fd634124-8b98-40f0-9c6d-60fc6a4e5d1d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_fd634124-8b98-40f0-9c6d-60fc6a4e5d1d" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_fd634124-8b98-40f0-9c6d-60fc6a4e5d1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_b7316518-246a-4505-b453-4cfcac8cc3bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_fd634124-8b98-40f0-9c6d-60fc6a4e5d1d" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_b7316518-246a-4505-b453-4cfcac8cc3bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_3efa60f8-167c-4f6c-b9fc-cb380b5f3629" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrivateEquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_b7316518-246a-4505-b453-4cfcac8cc3bd" xlink:to="loc_us-gaap_PrivateEquityFundsMember_3efa60f8-167c-4f6c-b9fc-cb380b5f3629" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_b7b78093-5a42-438a-a22c-b430a7b6c7cd" xlink:href="whg-20230331.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_b7316518-246a-4505-b453-4cfcac8cc3bd" xlink:to="loc_whg_PrivateEquityInvestmentsMember_b7b78093-5a42-438a-a22c-b430a7b6c7cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_98e49619-0d60-407b-a89f-0ff5a003af91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_748649db-9942-470e-bacd-d2b1761e3e5e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_98e49619-0d60-407b-a89f-0ff5a003af91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_98e49619-0d60-407b-a89f-0ff5a003af91_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_98e49619-0d60-407b-a89f-0ff5a003af91" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_98e49619-0d60-407b-a89f-0ff5a003af91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_98e49619-0d60-407b-a89f-0ff5a003af91" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_8981bfdd-8880-4d0b-b4cb-dc2b8ed016d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_8981bfdd-8880-4d0b-b4cb-dc2b8ed016d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_064764fc-d283-4ac2-9b60-ceae673d94da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_064764fc-d283-4ac2-9b60-ceae673d94da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_443bdec2-c790-4a2d-8a29-15de2bfda5bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_443bdec2-c790-4a2d-8a29-15de2bfda5bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_71390f95-cb3f-488d-a52e-abb0495b2a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_71390f95-cb3f-488d-a52e-abb0495b2a2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_4d0917bb-8722-4cb6-aa0d-bd16de0d38e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_fe5d0ff0-d7b1-4a50-8212-10414701f3d5" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_4d0917bb-8722-4cb6-aa0d-bd16de0d38e2" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetailsTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#VARIABLEINTERESTENTITIESDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetailsTextual" xlink:type="extended" id="i2fffeb76ee604540bc198225f1d35103_VARIABLEINTERESTENTITIESDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_9268feec-4204-48fa-8ca1-29af93508a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_071109fa-9978-4a88-85d0-8ede4a170014" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_9268feec-4204-48fa-8ca1-29af93508a5e" xlink:to="loc_us-gaap_TradingSecurities_071109fa-9978-4a88-85d0-8ede4a170014" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_12745bf9-7e11-4928-8651-48393cd8944d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_9268feec-4204-48fa-8ca1-29af93508a5e" xlink:to="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_12745bf9-7e11-4928-8651-48393cd8944d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_dbcf7744-238a-40cc-aa58-2ebb647e4478" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_9268feec-4204-48fa-8ca1-29af93508a5e" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_dbcf7744-238a-40cc-aa58-2ebb647e4478" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_cd838802-11d3-419a-a7af-a4aba50ec9ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_9268feec-4204-48fa-8ca1-29af93508a5e" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_cd838802-11d3-419a-a7af-a4aba50ec9ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_2226a476-530d-43c5-8490-f91d6833002b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_cd838802-11d3-419a-a7af-a4aba50ec9ad" xlink:to="loc_srt_ConsolidatedEntitiesAxis_2226a476-530d-43c5-8490-f91d6833002b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_2226a476-530d-43c5-8490-f91d6833002b_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_2226a476-530d-43c5-8490-f91d6833002b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_2226a476-530d-43c5-8490-f91d6833002b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_330fd6e0-f066-46b5-870c-23538eacef3b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_2226a476-530d-43c5-8490-f91d6833002b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_330fd6e0-f066-46b5-870c-23538eacef3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_VariableInterestEntityMember_de979f97-db0e-4a01-acde-16f52878f33c" xlink:href="whg-20230331.xsd#whg_VariableInterestEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_330fd6e0-f066-46b5-870c-23538eacef3b" xlink:to="loc_whg_VariableInterestEntityMember_de979f97-db0e-4a01-acde-16f52878f33c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CommonTrustFundsMember_fbc10d15-343f-4c43-b051-21bd045facb6" xlink:href="whg-20230331.xsd#whg_CommonTrustFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_330fd6e0-f066-46b5-870c-23538eacef3b" xlink:to="loc_whg_CommonTrustFundsMember_fbc10d15-343f-4c43-b051-21bd045facb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_e0aa071f-0f0a-4c91-a023-9fea318daff9" xlink:href="whg-20230331.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_330fd6e0-f066-46b5-870c-23538eacef3b" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_e0aa071f-0f0a-4c91-a023-9fea318daff9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#VARIABLEINTERESTENTITIESDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetails" xlink:type="extended" id="i7ad1a857c4e240fe9f7938079ca7cd9f_VARIABLEINTERESTENTITIESDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_fecc4938-0713-4f39-81c3-ca5c74905bea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_7151e7d1-3c9d-4008-9b31-d31806629ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_fecc4938-0713-4f39-81c3-ca5c74905bea" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_7151e7d1-3c9d-4008-9b31-d31806629ad0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsUnderManagementCarryingAmount_c07cefb9-5a32-4baa-907d-a34b2634a9fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsUnderManagementCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_7151e7d1-3c9d-4008-9b31-d31806629ad0" xlink:to="loc_us-gaap_AssetsUnderManagementCarryingAmount_c07cefb9-5a32-4baa-907d-a34b2634a9fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_b3d8ae6a-8859-4ab4-8523-f56349fb1de9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_7151e7d1-3c9d-4008-9b31-d31806629ad0" xlink:to="loc_us-gaap_TradingSecurities_b3d8ae6a-8859-4ab4-8523-f56349fb1de9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RiskOfLoss_243d0866-64d8-4f35-ad12-80c4582b5e20" xlink:href="whg-20230331.xsd#whg_RiskOfLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_7151e7d1-3c9d-4008-9b31-d31806629ad0" xlink:to="loc_whg_RiskOfLoss_243d0866-64d8-4f35-ad12-80c4582b5e20" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent_e544eb58-6200-43b1-a159-19dfa1610355" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_fecc4938-0713-4f39-81c3-ca5c74905bea" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent_e544eb58-6200-43b1-a159-19dfa1610355" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1a621a7c-3924-4da6-a4bf-bf19f37c1906" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_fecc4938-0713-4f39-81c3-ca5c74905bea" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1a621a7c-3924-4da6-a4bf-bf19f37c1906" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_c2f41843-18dd-4951-8d4b-32de8f6d4ee6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1a621a7c-3924-4da6-a4bf-bf19f37c1906" xlink:to="loc_srt_ConsolidatedEntitiesAxis_c2f41843-18dd-4951-8d4b-32de8f6d4ee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_c2f41843-18dd-4951-8d4b-32de8f6d4ee6_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_c2f41843-18dd-4951-8d4b-32de8f6d4ee6" xlink:to="loc_srt_ConsolidatedEntitiesDomain_c2f41843-18dd-4951-8d4b-32de8f6d4ee6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_c2f41843-18dd-4951-8d4b-32de8f6d4ee6" xlink:to="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_WestwoodFundsMember_b703b0cb-953f-4738-b82c-2d77892631f9" xlink:href="whg-20230331.xsd#whg_WestwoodFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_WestwoodFundsMember_b703b0cb-953f-4738-b82c-2d77892631f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CommonTrustFundsMember_9ec3f3e5-a26a-4e0c-952c-7f4c4a5f5ca6" xlink:href="whg-20230331.xsd#whg_CommonTrustFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_CommonTrustFundsMember_9ec3f3e5-a26a-4e0c-952c-7f4c4a5f5ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_d7dc3b0e-9909-4943-a23d-3e6d3031cca3" xlink:href="whg-20230331.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_d7dc3b0e-9909-4943-a23d-3e6d3031cca3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_WestwoodHospitalityFundILLCMember_19985475-27d8-4aaf-89bd-5f390d391a8f" xlink:href="whg-20230331.xsd#whg_WestwoodHospitalityFundILLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_WestwoodHospitalityFundILLCMember_19985475-27d8-4aaf-89bd-5f390d391a8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_d1ce8cb7-83dd-4ba1-9dd2-bf3f7e52b560" xlink:href="whg-20230331.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_PrivateEquityInvestmentsMember_d1ce8cb7-83dd-4ba1-9dd2-bf3f7e52b560" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateWealthMember_6047347d-b002-462d-934b-54f082e82360" xlink:href="whg-20230331.xsd#whg_PrivateWealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_PrivateWealthMember_6047347d-b002-462d-934b-54f082e82360" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_InstitutionalMember_ef9424ce-a0d3-4c75-a6df-c0e8ca5f332e" xlink:href="whg-20230331.xsd#whg_InstitutionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7797d945-6326-4ff1-8706-f0edc2ba4483" xlink:to="loc_whg_InstitutionalMember_ef9424ce-a0d3-4c75-a6df-c0e8ca5f332e" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#REVENUEDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="extended" id="i1686cbb481734b3c956d30d46afd1956_REVENUEDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_cf60858b-bad0-4960-ada0-d5eb94b925c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_80cb2e60-e8f1-47d7-b277-4ca64ead635f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_cf60858b-bad0-4960-ada0-d5eb94b925c7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_80cb2e60-e8f1-47d7-b277-4ca64ead635f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_390ef3ba-fbd5-43ec-b5bf-28b7da68c803" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_cf60858b-bad0-4960-ada0-d5eb94b925c7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_390ef3ba-fbd5-43ec-b5bf-28b7da68c803" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_ac05e069-2ee2-4d7d-a872-45b70b1f5f0d" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_390ef3ba-fbd5-43ec-b5bf-28b7da68c803" xlink:to="loc_srt_ProductOrServiceAxis_ac05e069-2ee2-4d7d-a872-45b70b1f5f0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ac05e069-2ee2-4d7d-a872-45b70b1f5f0d_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ac05e069-2ee2-4d7d-a872-45b70b1f5f0d" xlink:to="loc_srt_ProductsAndServicesDomain_ac05e069-2ee2-4d7d-a872-45b70b1f5f0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ac05e069-2ee2-4d7d-a872-45b70b1f5f0d" xlink:to="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_InvestmentAdvisoryServicesMember_8ccf745f-7bb1-4820-bc22-b425c7f7be3a" xlink:href="whg-20230331.xsd#whg_InvestmentAdvisoryServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_InvestmentAdvisoryServicesMember_8ccf745f-7bb1-4820-bc22-b425c7f7be3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_MutualFundAdvisoryMemberMember_0458629f-4daa-418f-b237-184e5c1ebc24" xlink:href="whg-20230331.xsd#whg_MutualFundAdvisoryMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_MutualFundAdvisoryMemberMember_0458629f-4daa-418f-b237-184e5c1ebc24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateWealthAdvisoryMember_cb2d9dfa-6d9a-4dc6-913c-392502e19ec3" xlink:href="whg-20230331.xsd#whg_PrivateWealthAdvisoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_PrivateWealthAdvisoryMember_cb2d9dfa-6d9a-4dc6-913c-392502e19ec3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PerformancefeeMember_1751a09b-db4e-473d-8c0b-37272560e365" xlink:href="whg-20230331.xsd#whg_PerformancefeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_PerformancefeeMember_1751a09b-db4e-473d-8c0b-37272560e365" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustFeeMember_80101c88-c17d-4f9b-9d16-0b8b0a93b04f" xlink:href="whg-20230331.xsd#whg_TrustFeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_TrustFeeMember_80101c88-c17d-4f9b-9d16-0b8b0a93b04f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_OtherRevenueMiscServicesMember_017330d1-4fcf-4d43-8eb4-8bf600b779e7" xlink:href="whg-20230331.xsd#whg_OtherRevenueMiscServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_OtherRevenueMiscServicesMember_017330d1-4fcf-4d43-8eb4-8bf600b779e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustPerformanceBasedMember_e30a42dc-9d1e-47a6-92d5-83bbb2e2ee96" xlink:href="whg-20230331.xsd#whg_TrustPerformanceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e24a3131-5604-40ea-9346-b003517e59a1" xlink:to="loc_whg_TrustPerformanceBasedMember_e30a42dc-9d1e-47a6-92d5-83bbb2e2ee96" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_b22fb4ca-64c1-4884-a7d8-9346271e55c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_390ef3ba-fbd5-43ec-b5bf-28b7da68c803" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_b22fb4ca-64c1-4884-a7d8-9346271e55c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b22fb4ca-64c1-4884-a7d8-9346271e55c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b22fb4ca-64c1-4884-a7d8-9346271e55c5" xlink:to="loc_us-gaap_SegmentDomain_b22fb4ca-64c1-4884-a7d8-9346271e55c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_06cc84ec-ef52-4414-af72-2bce02e9ecee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b22fb4ca-64c1-4884-a7d8-9346271e55c5" xlink:to="loc_us-gaap_SegmentDomain_06cc84ec-ef52-4414-af72-2bce02e9ecee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustMember_19f20483-ff31-4952-867f-c4923a6e13a7" xlink:href="whg-20230331.xsd#whg_TrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_06cc84ec-ef52-4414-af72-2bce02e9ecee" xlink:to="loc_whg_TrustMember_19f20483-ff31-4952-867f-c4923a6e13a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_AdvisoryMember_1e8b6acf-c92a-4607-a7b5-cb37cf180947" xlink:href="whg-20230331.xsd#whg_AdvisoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_06cc84ec-ef52-4414-af72-2bce02e9ecee" xlink:to="loc_whg_AdvisoryMember_1e8b6acf-c92a-4607-a7b5-cb37cf180947" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_465984cc-f0a0-43a8-98bb-3d64de0559d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_390ef3ba-fbd5-43ec-b5bf-28b7da68c803" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_465984cc-f0a0-43a8-98bb-3d64de0559d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_465984cc-f0a0-43a8-98bb-3d64de0559d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_465984cc-f0a0-43a8-98bb-3d64de0559d1" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_465984cc-f0a0-43a8-98bb-3d64de0559d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_d46c0bd4-33ae-4515-ace1-0d48e32207e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_465984cc-f0a0-43a8-98bb-3d64de0559d1" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_d46c0bd4-33ae-4515-ace1-0d48e32207e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_8ae50b83-0dc6-4419-815a-cf60cbaf76c4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_390ef3ba-fbd5-43ec-b5bf-28b7da68c803" xlink:to="loc_srt_StatementGeographicalAxis_8ae50b83-0dc6-4419-815a-cf60cbaf76c4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_8ae50b83-0dc6-4419-815a-cf60cbaf76c4_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_8ae50b83-0dc6-4419-815a-cf60cbaf76c4" xlink:to="loc_srt_SegmentGeographicalDomain_8ae50b83-0dc6-4419-815a-cf60cbaf76c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_648eb603-855a-4f7a-842f-7b74ad9dcc94" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_8ae50b83-0dc6-4419-815a-cf60cbaf76c4" xlink:to="loc_srt_SegmentGeographicalDomain_648eb603-855a-4f7a-842f-7b74ad9dcc94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_14496ed1-1411-4569-880a-260839dd7849" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_648eb603-855a-4f7a-842f-7b74ad9dcc94" xlink:to="loc_srt_EuropeMember_14496ed1-1411-4569-880a-260839dd7849" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_9f6b9afb-0d3c-4c27-9483-b8a5f301a200" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_648eb603-855a-4f7a-842f-7b74ad9dcc94" xlink:to="loc_country_CA_9f6b9afb-0d3c-4c27-9483-b8a5f301a200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_87e41bcf-2b4a-4e1a-a531-914eaa9560a0" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_648eb603-855a-4f7a-842f-7b74ad9dcc94" xlink:to="loc_country_US_87e41bcf-2b4a-4e1a-a531-914eaa9560a0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetailsTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#LONGTERMINCENTIVECOMPENSATIONDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetailsTextual" xlink:type="extended" id="if201dbf77a2047b7b2df66689f8978bd_LONGTERMINCENTIVECOMPENSATIONDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_dd45136c-a296-4ca4-8275-dd6eb7088c71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_dd45136c-a296-4ca4-8275-dd6eb7088c71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e1545083-10a0-4831-bb82-15cb4d6fd478" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e1545083-10a0-4831-bb82-15cb4d6fd478" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal_580d4f1c-56fa-4c64-af17-0ff690104bb5" xlink:href="whg-20230331.xsd#whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal_580d4f1c-56fa-4c64-af17-0ff690104bb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_FundPurchasesOfCommonStock_b12803af-c7a5-4624-b0c8-fb52c8c4834f" xlink:href="whg-20230331.xsd#whg_FundPurchasesOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_whg_FundPurchasesOfCommonStock_b12803af-c7a5-4624-b0c8-fb52c8c4834f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant_96caac17-9450-4431-b39e-bf11b1c8cbd6" xlink:href="whg-20230331.xsd#whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant_96caac17-9450-4431-b39e-bf11b1c8cbd6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_af556fba-e140-4f59-9cbf-84222d75c52c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_SharePrice_af556fba-e140-4f59-9cbf-84222d75c52c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_64f707fd-8e58-4193-9d89-8821ce5c48cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_64f707fd-8e58-4193-9d89-8821ce5c48cc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_45e591c3-285c-4432-86fa-12f1b1ea3ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_45e591c3-285c-4432-86fa-12f1b1ea3ffc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_26a601a7-5b36-4fd5-866b-215f341ac6a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_26a601a7-5b36-4fd5-866b-215f341ac6a3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_72bd36a6-b192-4113-a712-3460420c0387" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_72bd36a6-b192-4113-a712-3460420c0387" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_392d8577-4f47-4cea-986c-9c3b710a4128" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_392d8577-4f47-4cea-986c-9c3b710a4128" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_83cbb004-c9e9-4350-9d5f-1f83e338d106" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_83cbb004-c9e9-4350-9d5f-1f83e338d106" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_56438d3e-b9d7-4ee7-bd34-e7b869591630" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_56438d3e-b9d7-4ee7-bd34-e7b869591630" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_MutualFundIncentiveAwardLiability_5066aa19-f592-424d-aeb4-7ed849eb8a5a" xlink:href="whg-20230331.xsd#whg_MutualFundIncentiveAwardLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_whg_MutualFundIncentiveAwardLiability_5066aa19-f592-424d-aeb4-7ed849eb8a5a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_0baa3d5f-59c5-4b13-838a-4ff17d38b3b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_0baa3d5f-59c5-4b13-838a-4ff17d38b3b0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockAwardForfeitures_8138a1a9-55a4-4116-8ff8-20d30b27dda8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockAwardForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_RestrictedStockAwardForfeitures_8138a1a9-55a4-4116-8ff8-20d30b27dda8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_66a3845c-fd98-42c7-86be-9c176644b796" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_66a3845c-fd98-42c7-86be-9c176644b796" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_198a07f1-152e-4b4a-a8fc-b9b66997bc07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_198a07f1-152e-4b4a-a8fc-b9b66997bc07" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_d11e6031-22fb-4bcf-b589-bfbf68276f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_d11e6031-22fb-4bcf-b589-bfbf68276f8a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b86b0010-90d9-4766-8cf5-3fa56bbe3503" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_3e92213a-b5f4-4466-ba95-1b5a27939765" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_us-gaap_VestingAxis_3e92213a-b5f4-4466-ba95-1b5a27939765" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_3e92213a-b5f4-4466-ba95-1b5a27939765_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_3e92213a-b5f4-4466-ba95-1b5a27939765" xlink:to="loc_us-gaap_VestingDomain_3e92213a-b5f4-4466-ba95-1b5a27939765_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_b955b687-5c7d-416b-9793-69bbf86f2f81" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_3e92213a-b5f4-4466-ba95-1b5a27939765" xlink:to="loc_us-gaap_VestingDomain_b955b687-5c7d-416b-9793-69bbf86f2f81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TargetAxis_25af5df6-f73a-476f-8af4-828f48d3b5b3" xlink:href="whg-20230331.xsd#whg_TargetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_whg_TargetAxis_25af5df6-f73a-476f-8af4-828f48d3b5b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TargetDomain_25af5df6-f73a-476f-8af4-828f48d3b5b3_default" xlink:href="whg-20230331.xsd#whg_TargetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_whg_TargetAxis_25af5df6-f73a-476f-8af4-828f48d3b5b3" xlink:to="loc_whg_TargetDomain_25af5df6-f73a-476f-8af4-828f48d3b5b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TargetDomain_cd83ae34-8798-4725-a712-b5b4b5adb3cd" xlink:href="whg-20230331.xsd#whg_TargetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_whg_TargetAxis_25af5df6-f73a-476f-8af4-828f48d3b5b3" xlink:to="loc_whg_TargetDomain_cd83ae34-8798-4725-a712-b5b4b5adb3cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_336d2b05-2342-4462-bb92-5098267ca5ed" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_srt_RangeAxis_336d2b05-2342-4462-bb92-5098267ca5ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_336d2b05-2342-4462-bb92-5098267ca5ed_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_336d2b05-2342-4462-bb92-5098267ca5ed" xlink:to="loc_srt_RangeMember_336d2b05-2342-4462-bb92-5098267ca5ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_af48925f-dbc8-4d02-ae5d-8f95fd8f3255" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_336d2b05-2342-4462-bb92-5098267ca5ed" xlink:to="loc_srt_RangeMember_af48925f-dbc8-4d02-ae5d-8f95fd8f3255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_835629c2-b2f5-44b9-8fb2-7d93012422d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_us-gaap_AwardTypeAxis_835629c2-b2f5-44b9-8fb2-7d93012422d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_835629c2-b2f5-44b9-8fb2-7d93012422d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_835629c2-b2f5-44b9-8fb2-7d93012422d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_835629c2-b2f5-44b9-8fb2-7d93012422d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4fab6342-9112-494c-9689-009824312d12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_835629c2-b2f5-44b9-8fb2-7d93012422d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4fab6342-9112-494c-9689-009824312d12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_68c62f9f-ff05-44f5-9d87-183a8a781aad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4fab6342-9112-494c-9689-009824312d12" xlink:to="loc_us-gaap_RestrictedStockMember_68c62f9f-ff05-44f5-9d87-183a8a781aad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CanadianPlanMember_8211ba70-f5d4-4a1d-af93-500519679ee4" xlink:href="whg-20230331.xsd#whg_CanadianPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4fab6342-9112-494c-9689-009824312d12" xlink:to="loc_whg_CanadianPlanMember_8211ba70-f5d4-4a1d-af93-500519679ee4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_MutualFundShareIncentiveAwardsMember_7efc304a-a1a1-4e4c-9747-4ceb5870a8a5" xlink:href="whg-20230331.xsd#whg_MutualFundShareIncentiveAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4fab6342-9112-494c-9689-009824312d12" xlink:to="loc_whg_MutualFundShareIncentiveAwardsMember_7efc304a-a1a1-4e4c-9747-4ceb5870a8a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_47c82a6c-4105-4c82-b64d-994a1c3c2f0d" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_dei_LegalEntityAxis_47c82a6c-4105-4c82-b64d-994a1c3c2f0d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_47c82a6c-4105-4c82-b64d-994a1c3c2f0d_default" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_47c82a6c-4105-4c82-b64d-994a1c3c2f0d" xlink:to="loc_dei_EntityDomain_47c82a6c-4105-4c82-b64d-994a1c3c2f0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3d9dfa37-f746-4557-a7d7-6dc75da5c268" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_47c82a6c-4105-4c82-b64d-994a1c3c2f0d" xlink:to="loc_dei_EntityDomain_3d9dfa37-f746-4557-a7d7-6dc75da5c268" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_WestwoodInternationalAdvisorsIncMember_1f865e51-3359-4478-9cf4-24586e52be6d" xlink:href="whg-20230331.xsd#whg_WestwoodInternationalAdvisorsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_3d9dfa37-f746-4557-a7d7-6dc75da5c268" xlink:to="loc_whg_WestwoodInternationalAdvisorsIncMember_1f865e51-3359-4478-9cf4-24586e52be6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_847c85f7-31d0-48b1-9f05-507d59961d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_847c85f7-31d0-48b1-9f05-507d59961d2a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_847c85f7-31d0-48b1-9f05-507d59961d2a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_847c85f7-31d0-48b1-9f05-507d59961d2a" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_847c85f7-31d0-48b1-9f05-507d59961d2a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_1328e33a-2262-4264-a9b3-64c78df15a79" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_847c85f7-31d0-48b1-9f05-507d59961d2a" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_1328e33a-2262-4264-a9b3-64c78df15a79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_fc9b7fae-f8b3-4c13-95b0-452e9b50bd8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_1328e33a-2262-4264-a9b3-64c78df15a79" xlink:to="loc_us-gaap_MutualFundMember_fc9b7fae-f8b3-4c13-95b0-452e9b50bd8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5c55e348-3bf9-43d7-bea3-6a921953bb98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_98d6b5e6-b4be-4ebe-b5a7-9088d9cdc8a2" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5c55e348-3bf9-43d7-bea3-6a921953bb98" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_5c55e348-3bf9-43d7-bea3-6a921953bb98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5c55e348-3bf9-43d7-bea3-6a921953bb98" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_5c55e348-3bf9-43d7-bea3-6a921953bb98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_98f8f156-ffc1-495c-9595-d7b64312cc4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5c55e348-3bf9-43d7-bea3-6a921953bb98" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_98f8f156-ffc1-495c-9595-d7b64312cc4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_9ac9d201-e70a-4023-994e-184dda679541" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_98f8f156-ffc1-495c-9595-d7b64312cc4c" xlink:to="loc_us-gaap_RestrictedStockMember_9ac9d201-e70a-4023-994e-184dda679541" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#LONGTERMINCENTIVECOMPENSATIONDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails" xlink:type="extended" id="i42e56ff5abaf420d9acab4cfeed8759d_LONGTERMINCENTIVECOMPENSATIONDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68bfd2ff-6ec5-4d85-9a97-5ecd7e5acb1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_2e35c987-bfe3-4e55-a120-9c2072b5fbcf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68bfd2ff-6ec5-4d85-9a97-5ecd7e5acb1f" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_2e35c987-bfe3-4e55-a120-9c2072b5fbcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a6e653c-b64a-47f9-a80f-a20b335daa8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68bfd2ff-6ec5-4d85-9a97-5ecd7e5acb1f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a6e653c-b64a-47f9-a80f-a20b335daa8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_845b6372-92d2-4b65-a16c-e463f24cdb0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a6e653c-b64a-47f9-a80f-a20b335daa8d" xlink:to="loc_us-gaap_AwardTypeAxis_845b6372-92d2-4b65-a16c-e463f24cdb0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_845b6372-92d2-4b65-a16c-e463f24cdb0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_845b6372-92d2-4b65-a16c-e463f24cdb0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_845b6372-92d2-4b65-a16c-e463f24cdb0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_845b6372-92d2-4b65-a16c-e463f24cdb0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DomesticEmployeeServiceAwardMember_5f9de510-97d7-4417-b0ce-2df387229c3a" xlink:href="whg-20230331.xsd#whg_DomesticEmployeeServiceAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:to="loc_whg_DomesticEmployeeServiceAwardMember_5f9de510-97d7-4417-b0ce-2df387229c3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_d9cd9323-1b18-427d-bc93-591d10b24643" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:to="loc_us-gaap_PerformanceSharesMember_d9cd9323-1b18-427d-bc93-591d10b24643" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DomesticServiceAndPerformanceAwardMember_a8f5cd7d-9d3e-4509-bf64-3b992efaba6d" xlink:href="whg-20230331.xsd#whg_DomesticServiceAndPerformanceAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:to="loc_whg_DomesticServiceAndPerformanceAwardMember_a8f5cd7d-9d3e-4509-bf64-3b992efaba6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CanadianEmployeeServiceAwardMember_eca402a5-eaf5-4e78-bdb0-a754850ed0c5" xlink:href="whg-20230331.xsd#whg_CanadianEmployeeServiceAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:to="loc_whg_CanadianEmployeeServiceAwardMember_eca402a5-eaf5-4e78-bdb0-a754850ed0c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_a236c323-1666-4221-aaee-337f5b719e91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e382f0f9-39bb-4297-b474-1934433d15b6" xlink:to="loc_us-gaap_RestrictedStockMember_a236c323-1666-4221-aaee-337f5b719e91" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_a1d77f5f-4965-48d5-827e-1c7aaa82c418" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a6e653c-b64a-47f9-a80f-a20b335daa8d" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_a1d77f5f-4965-48d5-827e-1c7aaa82c418" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a1d77f5f-4965-48d5-827e-1c7aaa82c418_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_a1d77f5f-4965-48d5-827e-1c7aaa82c418" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a1d77f5f-4965-48d5-827e-1c7aaa82c418_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_31f7003a-29ea-456f-bdb7-9641a6446226" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_a1d77f5f-4965-48d5-827e-1c7aaa82c418" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_31f7003a-29ea-456f-bdb7-9641a6446226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_5aeba2a6-d189-43ec-9a84-e9ac9c52fcc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a6e653c-b64a-47f9-a80f-a20b335daa8d" xlink:to="loc_us-gaap_PlanNameAxis_5aeba2a6-d189-43ec-9a84-e9ac9c52fcc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_5aeba2a6-d189-43ec-9a84-e9ac9c52fcc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_5aeba2a6-d189-43ec-9a84-e9ac9c52fcc0" xlink:to="loc_us-gaap_PlanNameDomain_5aeba2a6-d189-43ec-9a84-e9ac9c52fcc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_1e68cd7c-8836-4cd2-b24a-3b05d38d232a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_5aeba2a6-d189-43ec-9a84-e9ac9c52fcc0" xlink:to="loc_us-gaap_PlanNameDomain_1e68cd7c-8836-4cd2-b24a-3b05d38d232a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails1" xlink:type="simple" xlink:href="whg-20230331.xsd#LONGTERMINCENTIVECOMPENSATIONDetails1"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails1" xlink:type="extended" id="i369ab48bc8824263a2d764a8d666908f_LONGTERMINCENTIVECOMPENSATIONDetails1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7e1a1610-d3e2-4f84-9037-09965fa0df2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7e1a1610-d3e2-4f84-9037-09965fa0df2d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5f77f18a-5315-44f3-aa35-08012c6a022f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5f77f18a-5315-44f3-aa35-08012c6a022f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_548692ba-9fe6-43e2-88fe-fe487ad61bd5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_548692ba-9fe6-43e2-88fe-fe487ad61bd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_cf660dd7-d2b9-4c45-aada-d7294b3a02bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_cf660dd7-d2b9-4c45-aada-d7294b3a02bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2fc09073-493b-4b07-b5a7-056e239c06fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2fc09073-493b-4b07-b5a7-056e239c06fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_cb1606bc-fa8b-495d-ab50-bb14065917c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_330ab03f-72b4-4d82-8909-d5162d9aec58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_330ab03f-72b4-4d82-8909-d5162d9aec58" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_d621e376-3457-42a9-8cc2-0ab7384df24b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_d621e376-3457-42a9-8cc2-0ab7384df24b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_5df1cac6-dc73-4453-bd58-b513e595a9bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_5df1cac6-dc73-4453-bd58-b513e595a9bb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f68c9814-c157-40b4-bc26-17ed7b45d50f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2dbb8a92-d06a-44d3-89f3-cb41f829526d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f68c9814-c157-40b4-bc26-17ed7b45d50f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c2751972-a605-44ca-b551-0817e36ca14b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ed6ef9ce-96fa-4de6-a800-11dd1ef53c15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7e1a1610-d3e2-4f84-9037-09965fa0df2d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ed6ef9ce-96fa-4de6-a800-11dd1ef53c15" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_598fd928-840e-47ba-8306-458724db6680" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ed6ef9ce-96fa-4de6-a800-11dd1ef53c15" xlink:to="loc_us-gaap_AwardTypeAxis_598fd928-840e-47ba-8306-458724db6680" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_598fd928-840e-47ba-8306-458724db6680_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_598fd928-840e-47ba-8306-458724db6680" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_598fd928-840e-47ba-8306-458724db6680_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8dec97a3-9e54-4aa9-83b9-6c287c1c360f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_598fd928-840e-47ba-8306-458724db6680" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8dec97a3-9e54-4aa9-83b9-6c287c1c360f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_514b0fca-3fe5-4059-a016-efbb1b91a7dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8dec97a3-9e54-4aa9-83b9-6c287c1c360f" xlink:to="loc_us-gaap_RestrictedStockMember_514b0fca-3fe5-4059-a016-efbb1b91a7dc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails2" xlink:type="simple" xlink:href="whg-20230331.xsd#LONGTERMINCENTIVECOMPENSATIONDetails2"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails2" xlink:type="extended" id="i7ee9d21e70174af5b787c86b2eb8b5b3_LONGTERMINCENTIVECOMPENSATIONDetails2">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_74248662-66d7-48f7-9a2a-b4dd31e52518" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_74248662-66d7-48f7-9a2a-b4dd31e52518" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_f8b7d633-13b9-4be4-a3c9-3e5a93fb3d46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_f8b7d633-13b9-4be4-a3c9-3e5a93fb3d46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4776915b-3cb3-4e98-89ac-39ad1377ea46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4776915b-3cb3-4e98-89ac-39ad1377ea46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_462b0b50-8fff-4f12-8e95-8ff9e8052d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_462b0b50-8fff-4f12-8e95-8ff9e8052d2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2c993b67-dfa5-43b9-bbf4-a0bb1a2e4c27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2c993b67-dfa5-43b9-bbf4-a0bb1a2e4c27" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_603ba92c-f69a-40aa-8f9c-8c642d7837a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c778342e-0803-42f7-a4a5-00b9167d25de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c778342e-0803-42f7-a4a5-00b9167d25de" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_d2d75ff6-3c89-43d7-a324-e91558d5c557" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_d2d75ff6-3c89-43d7-a324-e91558d5c557" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_db47578c-e3ca-43af-94d9-a64048ba9375" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_db47578c-e3ca-43af-94d9-a64048ba9375" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_db0ed5f4-e977-47de-be71-095d4ed400cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_a6dd8fe4-69e0-417e-9b77-4c31e603639c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_db0ed5f4-e977-47de-be71-095d4ed400cb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_44d49ff7-abec-43e1-80c4-5f9f5a6beeab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8fe5d978-5101-4683-a479-665fac93a0a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_74248662-66d7-48f7-9a2a-b4dd31e52518" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8fe5d978-5101-4683-a479-665fac93a0a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_9a555588-c898-4d15-a48b-ea6fbda05bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8fe5d978-5101-4683-a479-665fac93a0a2" xlink:to="loc_us-gaap_AwardTypeAxis_9a555588-c898-4d15-a48b-ea6fbda05bfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9a555588-c898-4d15-a48b-ea6fbda05bfe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9a555588-c898-4d15-a48b-ea6fbda05bfe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9a555588-c898-4d15-a48b-ea6fbda05bfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3d200031-fe95-4ac4-874d-03b95b428252" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9a555588-c898-4d15-a48b-ea6fbda05bfe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3d200031-fe95-4ac4-874d-03b95b428252" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_3a7173c6-5818-4894-a442-b9b1d43e4782" xlink:href="whg-20230331.xsd#whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3d200031-fe95-4ac4-874d-03b95b428252" xlink:to="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_3a7173c6-5818-4894-a442-b9b1d43e4782" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/RELATEDPARTYTRANSACTIONSDetailsTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#RELATEDPARTYTRANSACTIONSDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RELATEDPARTYTRANSACTIONSDetailsTextual" xlink:type="extended" id="id363c930961b407e8253233fbd7eea74_RELATEDPARTYTRANSACTIONSDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_6f18a466-32c2-49b9-8977-f301c993f60c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueFromRelatedParties_06a613b4-8748-4d27-902c-e5b8ccfd5686" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6f18a466-32c2-49b9-8977-f301c993f60c" xlink:to="loc_us-gaap_DueFromRelatedParties_06a613b4-8748-4d27-902c-e5b8ccfd5686" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromRelatedParties_14b89d25-33f1-4270-8677-e1def75ff1da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6f18a466-32c2-49b9-8977-f301c993f60c" xlink:to="loc_us-gaap_RevenueFromRelatedParties_14b89d25-33f1-4270-8677-e1def75ff1da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_2d420f83-1007-4c45-bbb7-b1dc20ac5ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6f18a466-32c2-49b9-8977-f301c993f60c" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_2d420f83-1007-4c45-bbb7-b1dc20ac5ee4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_4cabcae5-52d1-4dbc-95ee-231977420a7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6f18a466-32c2-49b9-8977-f301c993f60c" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_4cabcae5-52d1-4dbc-95ee-231977420a7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_964a0f2c-94cd-4701-a513-9715a9035d24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6f18a466-32c2-49b9-8977-f301c993f60c" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_964a0f2c-94cd-4701-a513-9715a9035d24" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b30b52f8-2ae0-4504-a9a7-990cb911a58b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_964a0f2c-94cd-4701-a513-9715a9035d24" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b30b52f8-2ae0-4504-a9a7-990cb911a58b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_b30b52f8-2ae0-4504-a9a7-990cb911a58b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b30b52f8-2ae0-4504-a9a7-990cb911a58b" xlink:to="loc_us-gaap_RelatedPartyDomain_b30b52f8-2ae0-4504-a9a7-990cb911a58b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1f254f11-d6f8-4539-a977-f487f08d8abe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b30b52f8-2ae0-4504-a9a7-990cb911a58b" xlink:to="loc_us-gaap_RelatedPartyDomain_1f254f11-d6f8-4539-a977-f487f08d8abe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrustForBenefitOfEmployeesMember_5c173da6-e7e7-4ee8-80c1-b2c81e9db68f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TrustForBenefitOfEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_1f254f11-d6f8-4539-a977-f487f08d8abe" xlink:to="loc_us-gaap_TrustForBenefitOfEmployeesMember_5c173da6-e7e7-4ee8-80c1-b2c81e9db68f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_0762eca3-7aa0-4bf7-b2bc-1ad47332860e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_964a0f2c-94cd-4701-a513-9715a9035d24" xlink:to="loc_srt_ConsolidatedEntitiesAxis_0762eca3-7aa0-4bf7-b2bc-1ad47332860e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_0762eca3-7aa0-4bf7-b2bc-1ad47332860e_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_0762eca3-7aa0-4bf7-b2bc-1ad47332860e" xlink:to="loc_srt_ConsolidatedEntitiesDomain_0762eca3-7aa0-4bf7-b2bc-1ad47332860e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_617bb598-3be4-4078-a937-5385e7ff182c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_0762eca3-7aa0-4bf7-b2bc-1ad47332860e" xlink:to="loc_srt_ConsolidatedEntitiesDomain_617bb598-3be4-4078-a937-5385e7ff182c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_c2796e33-4cbc-438e-9fa3-087225e4a017" xlink:href="whg-20230331.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_617bb598-3be4-4078-a937-5385e7ff182c" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_c2796e33-4cbc-438e-9fa3-087225e4a017" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_610d75bb-3012-4a25-8ed2-c06591c66082" xlink:href="whg-20230331.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_617bb598-3be4-4078-a937-5385e7ff182c" xlink:to="loc_whg_PrivateEquityInvestmentsMember_610d75bb-3012-4a25-8ed2-c06591c66082" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LEASESTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#LEASESTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LEASESTextual" xlink:type="extended" id="i3aa1969bf8e445478563e38dbd77b104_LEASESTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_82df9dcf-5650-49e0-aaed-439fc201000c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_2b20e1f2-18c2-444e-99c5-0922283456bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubleaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_82df9dcf-5650-49e0-aaed-439fc201000c" xlink:to="loc_us-gaap_SubleaseIncome_2b20e1f2-18c2-444e-99c5-0922283456bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_9dd3dd30-7c74-44c1-91f4-eee033254cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_82df9dcf-5650-49e0-aaed-439fc201000c" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_9dd3dd30-7c74-44c1-91f4-eee033254cc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_6a1b1cad-f178-41c0-b8c4-97d20f814e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_82df9dcf-5650-49e0-aaed-439fc201000c" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_6a1b1cad-f178-41c0-b8c4-97d20f814e2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_82df9dcf-5650-49e0-aaed-439fc201000c" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_81835572-c659-4633-a0e5-298c2626aab3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:to="loc_srt_CounterpartyNameAxis_81835572-c659-4633-a0e5-298c2626aab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_81835572-c659-4633-a0e5-298c2626aab3_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_81835572-c659-4633-a0e5-298c2626aab3" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_81835572-c659-4633-a0e5-298c2626aab3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ec7d98e3-dca5-47fb-ab16-9d01b7472e6f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_81835572-c659-4633-a0e5-298c2626aab3" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ec7d98e3-dca5-47fb-ab16-9d01b7472e6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_dab00859-20ea-4602-bb10-156ad85f1304" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_dab00859-20ea-4602-bb10-156ad85f1304" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_dab00859-20ea-4602-bb10-156ad85f1304_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_dab00859-20ea-4602-bb10-156ad85f1304" xlink:to="loc_us-gaap_SegmentDomain_dab00859-20ea-4602-bb10-156ad85f1304_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ea6b5be0-724f-446d-9b11-c3aa00e3634a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_dab00859-20ea-4602-bb10-156ad85f1304" xlink:to="loc_us-gaap_SegmentDomain_ea6b5be0-724f-446d-9b11-c3aa00e3634a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionAxis_1351fb1a-d591-4944-8e4b-37d0e8a99ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicDistributionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:to="loc_us-gaap_GeographicDistributionAxis_1351fb1a-d591-4944-8e4b-37d0e8a99ff0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_1351fb1a-d591-4944-8e4b-37d0e8a99ff0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GeographicDistributionAxis_1351fb1a-d591-4944-8e4b-37d0e8a99ff0" xlink:to="loc_us-gaap_GeographicDistributionDomain_1351fb1a-d591-4944-8e4b-37d0e8a99ff0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_7c38b42f-49d0-46c4-9b8c-661986e85775" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GeographicDistributionAxis_1351fb1a-d591-4944-8e4b-37d0e8a99ff0" xlink:to="loc_us-gaap_GeographicDistributionDomain_7c38b42f-49d0-46c4-9b8c-661986e85775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_cb6fef86-6cc6-4bc9-a0cc-932765119dc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_cb6fef86-6cc6-4bc9-a0cc-932765119dc0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_cb6fef86-6cc6-4bc9-a0cc-932765119dc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_cb6fef86-6cc6-4bc9-a0cc-932765119dc0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_cb6fef86-6cc6-4bc9-a0cc-932765119dc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7cfccf38-a34f-4404-9177-38cfb23c9e11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_cb6fef86-6cc6-4bc9-a0cc-932765119dc0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7cfccf38-a34f-4404-9177-38cfb23c9e11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_8cafa545-ffc9-4bc9-b818-75635c4dd61d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_588cc24d-b684-4dbe-bf72-9b6370cd29f8" xlink:to="loc_us-gaap_LeaseContractualTermAxis_8cafa545-ffc9-4bc9-b818-75635c4dd61d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_8cafa545-ffc9-4bc9-b818-75635c4dd61d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_8cafa545-ffc9-4bc9-b818-75635c4dd61d" xlink:to="loc_us-gaap_LeaseContractualTermDomain_8cafa545-ffc9-4bc9-b818-75635c4dd61d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_81f40142-84fe-4178-9382-d38431b07b22" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_8cafa545-ffc9-4bc9-b818-75635c4dd61d" xlink:to="loc_us-gaap_LeaseContractualTermDomain_81f40142-84fe-4178-9382-d38431b07b22" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/SEGMENTREPORTINGDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#SEGMENTREPORTINGDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SEGMENTREPORTINGDetails" xlink:type="extended" id="i1d40a4f0e3a04071890d042f49117dab_SEGMENTREPORTINGDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RevenueFromExternalSources_a432bf9c-02c6-4d58-9dab-1559667c1cfe" xlink:href="whg-20230331.xsd#whg_RevenueFromExternalSources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_whg_RevenueFromExternalSources_a432bf9c-02c6-4d58-9dab-1559667c1cfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_NetIntersegmentRevenues_5f3aca90-5f03-4d4c-a7d3-572306200cf0" xlink:href="whg-20230331.xsd#whg_NetIntersegmentRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_whg_NetIntersegmentRevenues_5f3aca90-5f03-4d4c-a7d3-572306200cf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_61c7accf-48ab-440a-8deb-b566dea229dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentIncomeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_us-gaap_InvestmentIncomeNet_61c7accf-48ab-440a-8deb-b566dea229dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Otherrevenue_05b422e6-099f-4ac4-8ea2-63b55557ccc6" xlink:href="whg-20230331.xsd#whg_Otherrevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_whg_Otherrevenue_05b422e6-099f-4ac4-8ea2-63b55557ccc6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_bff40fa2-56fa-4e79-bacb-d9fd85f9fc1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_us-gaap_Revenues_bff40fa2-56fa-4e79-bacb-d9fd85f9fc1f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_5a9bffb0-042b-4373-99fd-006564358c8e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_us-gaap_Assets_5a9bffb0-042b-4373-99fd-006564358c8e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_6bb1f88b-2496-4073-ab32-b38d6eb9f25e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_us-gaap_Goodwill_6bb1f88b-2496-4073-ab32-b38d6eb9f25e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_550ab9ab-7a9a-42e3-a0e6-b86ebc2ced75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_85d675f3-ee90-4c49-ad3b-1bdc3eda8771" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_550ab9ab-7a9a-42e3-a0e6-b86ebc2ced75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_45ea23d5-d4b5-4365-b39c-756e533bc889" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_550ab9ab-7a9a-42e3-a0e6-b86ebc2ced75" xlink:to="loc_us-gaap_AwardTypeAxis_45ea23d5-d4b5-4365-b39c-756e533bc889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_45ea23d5-d4b5-4365-b39c-756e533bc889_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_45ea23d5-d4b5-4365-b39c-756e533bc889" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_45ea23d5-d4b5-4365-b39c-756e533bc889_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6f6c78e4-2791-4d4a-b256-db7e038521d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_45ea23d5-d4b5-4365-b39c-756e533bc889" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6f6c78e4-2791-4d4a-b256-db7e038521d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_16973c32-2dab-450c-8fec-0329f62df3d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6f6c78e4-2791-4d4a-b256-db7e038521d9" xlink:to="loc_us-gaap_RestrictedStockMember_16973c32-2dab-450c-8fec-0329f62df3d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_55bb5c9d-285c-43c1-9d4f-c3eefedc4478" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_550ab9ab-7a9a-42e3-a0e6-b86ebc2ced75" xlink:to="loc_srt_ConsolidationItemsAxis_55bb5c9d-285c-43c1-9d4f-c3eefedc4478" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_55bb5c9d-285c-43c1-9d4f-c3eefedc4478_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_55bb5c9d-285c-43c1-9d4f-c3eefedc4478" xlink:to="loc_srt_ConsolidationItemsDomain_55bb5c9d-285c-43c1-9d4f-c3eefedc4478_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_922b7650-121e-41e9-8b2e-cbf795455d18" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_55bb5c9d-285c-43c1-9d4f-c3eefedc4478" xlink:to="loc_srt_ConsolidationItemsDomain_922b7650-121e-41e9-8b2e-cbf795455d18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_3d3d7aa6-23fc-4608-8b7a-303bb5d463d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_922b7650-121e-41e9-8b2e-cbf795455d18" xlink:to="loc_us-gaap_OperatingSegmentsMember_3d3d7aa6-23fc-4608-8b7a-303bb5d463d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_4e9fd1f5-7a85-46e6-b6a8-8d86ea1d759b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_922b7650-121e-41e9-8b2e-cbf795455d18" xlink:to="loc_us-gaap_CorporateNonSegmentMember_4e9fd1f5-7a85-46e6-b6a8-8d86ea1d759b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_5712a808-dd04-4456-bd6e-34ba90a5e5bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_922b7650-121e-41e9-8b2e-cbf795455d18" xlink:to="loc_us-gaap_IntersegmentEliminationMember_5712a808-dd04-4456-bd6e-34ba90a5e5bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_e7e9731e-2a60-421d-93de-fd9aee871cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_550ab9ab-7a9a-42e3-a0e6-b86ebc2ced75" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_e7e9731e-2a60-421d-93de-fd9aee871cf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e7e9731e-2a60-421d-93de-fd9aee871cf3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e7e9731e-2a60-421d-93de-fd9aee871cf3" xlink:to="loc_us-gaap_SegmentDomain_e7e9731e-2a60-421d-93de-fd9aee871cf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8321bcbf-9257-4cd8-a7e8-02427b4dcac2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e7e9731e-2a60-421d-93de-fd9aee871cf3" xlink:to="loc_us-gaap_SegmentDomain_8321bcbf-9257-4cd8-a7e8-02427b4dcac2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_AdvisoryMember_fd3caa8f-af95-4fbe-aadf-4942738345a1" xlink:href="whg-20230331.xsd#whg_AdvisoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8321bcbf-9257-4cd8-a7e8-02427b4dcac2" xlink:to="loc_whg_AdvisoryMember_fd3caa8f-af95-4fbe-aadf-4942738345a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustMember_d61ca3f0-15dc-42e7-ba6d-9a615ff6c6ab" xlink:href="whg-20230331.xsd#whg_TrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8321bcbf-9257-4cd8-a7e8-02427b4dcac2" xlink:to="loc_whg_TrustMember_d61ca3f0-15dc-42e7-ba6d-9a615ff6c6ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_31b6f2e8-e7a4-4852-96a7-3427271dfb01" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8321bcbf-9257-4cd8-a7e8-02427b4dcac2" xlink:to="loc_us-gaap_CorporateNonSegmentMember_31b6f2e8-e7a4-4852-96a7-3427271dfb01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_41f0441b-09b6-497a-8f86-857032c9e119" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8321bcbf-9257-4cd8-a7e8-02427b4dcac2" xlink:to="loc_us-gaap_IntersegmentEliminationMember_41f0441b-09b6-497a-8f86-857032c9e119" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/SUBSEQUENTEVENTSDetailsTextual" xlink:type="simple" xlink:href="whg-20230331.xsd#SUBSEQUENTEVENTSDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SUBSEQUENTEVENTSDetailsTextual" xlink:type="extended" id="i5bcaf540dd424a0da22be884f84d47a0_SUBSEQUENTEVENTSDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_766f72c9-285d-4d5c-acfb-bc6e923e13c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_766f72c9-285d-4d5c-acfb-bc6e923e13c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_51229591-e5dc-4d3c-8028-cc157d203063" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_51229591-e5dc-4d3c-8028-cc157d203063" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_9a0aec85-c513-4568-9050-9a4dfb7416bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsPayableDateOfRecordDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_9a0aec85-c513-4568-9050-9a4dfb7416bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_9b371bd3-9bfb-4f0b-897f-a90b65b2d0db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_9b371bd3-9bfb-4f0b-897f-a90b65b2d0db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_55438c41-20f7-4f8c-8caa-598554960ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_55438c41-20f7-4f8c-8caa-598554960ee1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_460241a2-0102-4b5c-a09d-2232722b2e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_460241a2-0102-4b5c-a09d-2232722b2e4d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_d9be3cdc-a11f-48ff-b6a8-369829222637" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_d9be3cdc-a11f-48ff-b6a8-369829222637" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_StockRepurchaseProgram_2a7c37c4-4300-4910-9217-2aebb27a0fb7" xlink:href="whg-20230331.xsd#whg_StockRepurchaseProgram"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_whg_StockRepurchaseProgram_2a7c37c4-4300-4910-9217-2aebb27a0fb7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_StockRepurchaseAuthorizationSubsequentEvent_cdf5edfc-2b5e-4696-828f-071e5f7cd096" xlink:href="whg-20230331.xsd#whg_StockRepurchaseAuthorizationSubsequentEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_whg_StockRepurchaseAuthorizationSubsequentEvent_cdf5edfc-2b5e-4696-828f-071e5f7cd096" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventDescription_ca136257-5425-456c-8516-4876be88f6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_SubsequentEventDescription_ca136257-5425-456c-8516-4876be88f6b9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_b1b41e08-96ab-4578-b52c-2237774f491e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_b1b41e08-96ab-4578-b52c-2237774f491e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_1451acb7-e949-4646-8f15-60d2c66d45af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_86c1b535-4d52-43aa-ad42-186fd4bf0570" xlink:to="loc_us-gaap_SubsequentEventTable_1451acb7-e949-4646-8f15-60d2c66d45af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_a3382170-af50-4543-8794-67ed6d66f05c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_1451acb7-e949-4646-8f15-60d2c66d45af" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_a3382170-af50-4543-8794-67ed6d66f05c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a3382170-af50-4543-8794-67ed6d66f05c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a3382170-af50-4543-8794-67ed6d66f05c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a3382170-af50-4543-8794-67ed6d66f05c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_993cf98c-3e27-4fd3-89ad-654eb3578f1b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a3382170-af50-4543-8794-67ed6d66f05c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_993cf98c-3e27-4fd3-89ad-654eb3578f1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_f9f6e8e1-14ee-4cfe-8871-68adb5c4af0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_993cf98c-3e27-4fd3-89ad-654eb3578f1b" xlink:to="loc_us-gaap_SubsequentEventMember_f9f6e8e1-14ee-4cfe-8871-68adb5c4af0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_6e0a57e1-f321-434e-a3f6-3f893eda7d3c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_1451acb7-e949-4646-8f15-60d2c66d45af" xlink:to="loc_srt_ProductOrServiceAxis_6e0a57e1-f321-434e-a3f6-3f893eda7d3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6e0a57e1-f321-434e-a3f6-3f893eda7d3c_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_6e0a57e1-f321-434e-a3f6-3f893eda7d3c" xlink:to="loc_srt_ProductsAndServicesDomain_6e0a57e1-f321-434e-a3f6-3f893eda7d3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_db296802-88af-4e4f-800b-d5a888b2563c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_6e0a57e1-f321-434e-a3f6-3f893eda7d3c" xlink:to="loc_srt_ProductsAndServicesDomain_db296802-88af-4e4f-800b-d5a888b2563c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustPerformanceBasedFeesMember_37489289-8b7f-4972-8a6a-72d4f092186f" xlink:href="whg-20230331.xsd#whg_TrustPerformanceBasedFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_db296802-88af-4e4f-800b-d5a888b2563c" xlink:to="loc_whg_TrustPerformanceBasedFeesMember_37489289-8b7f-4972-8a6a-72d4f092186f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/BusinessCombinationsandAssetAcquisitionsDetails" xlink:type="simple" xlink:href="whg-20230331.xsd#BusinessCombinationsandAssetAcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/BusinessCombinationsandAssetAcquisitionsDetails" xlink:type="extended" id="i4664e5d247e1499692a103dfc66a2192_BusinessCombinationsandAssetAcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_5813beb6-886a-46ea-aa44-34602fb19c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_5813beb6-886a-46ea-aa44-34602fb19c1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_9ce999fc-4077-42a8-a179-fac1f1a6d05e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_9ce999fc-4077-42a8-a179-fac1f1a6d05e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_40d208d9-9c79-4207-877f-313a19071dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_40d208d9-9c79-4207-877f-313a19071dd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeDescription_4c250a48-4e27-4448-9d4e-06afe16a5119" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeDescription_4c250a48-4e27-4448-9d4e-06afe16a5119" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_cacee086-bfa0-482d-957e-74bee782a1ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_cacee086-bfa0-482d-957e-74bee782a1ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_822109f3-4432-44ae-8cd5-ae7564b581a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_822109f3-4432-44ae-8cd5-ae7564b581a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_BusinessCombinationAcquisitionOfLessThan100PercentOfBroadmarkNoncontontrollingInterest_b0ffd286-c4ba-4d2b-8fc3-21e58bc8e78f" xlink:href="whg-20230331.xsd#whg_BusinessCombinationAcquisitionOfLessThan100PercentOfBroadmarkNoncontontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_whg_BusinessCombinationAcquisitionOfLessThan100PercentOfBroadmarkNoncontontrollingInterest_b0ffd286-c4ba-4d2b-8fc3-21e58bc8e78f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_BusinessCombinationConsiderationTransferredForBroadmark_87c02e47-f1d8-49a6-a2ae-79e5a88d2ae4" xlink:href="whg-20230331.xsd#whg_BusinessCombinationConsiderationTransferredForBroadmark"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_whg_BusinessCombinationConsiderationTransferredForBroadmark_87c02e47-f1d8-49a6-a2ae-79e5a88d2ae4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PaymentsToAcquireBroadmarkGross_dc1f6519-b89e-4892-a73e-11bce920ee51" xlink:href="whg-20230331.xsd#whg_PaymentsToAcquireBroadmarkGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_whg_PaymentsToAcquireBroadmarkGross_dc1f6519-b89e-4892-a73e-11bce920ee51" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionTable_1e8eddd9-3c87-4282-a70d-a643e1182616" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AssetAcquisitionLineItems_d1fe042d-11c4-491a-9016-2c20e3bb3557" xlink:to="loc_us-gaap_AssetAcquisitionTable_1e8eddd9-3c87-4282-a70d-a643e1182616" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_21c615de-25ca-4ef2-a55f-6d716e346a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AssetAcquisitionTable_1e8eddd9-3c87-4282-a70d-a643e1182616" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_21c615de-25ca-4ef2-a55f-6d716e346a4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_21c615de-25ca-4ef2-a55f-6d716e346a4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_21c615de-25ca-4ef2-a55f-6d716e346a4a" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_21c615de-25ca-4ef2-a55f-6d716e346a4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_462e3d0d-262d-482f-ac7a-1975b27f285e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_21c615de-25ca-4ef2-a55f-6d716e346a4a" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_462e3d0d-262d-482f-ac7a-1975b27f285e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_51aa2156-3bee-4c26-930a-c3d8b3b7cd79" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_462e3d0d-262d-482f-ac7a-1975b27f285e" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_51aa2156-3bee-4c26-930a-c3d8b3b7cd79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_95650215-49d8-4716-a7fd-819a58cea057" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_462e3d0d-262d-482f-ac7a-1975b27f285e" xlink:to="loc_us-gaap_AccountsReceivableMember_95650215-49d8-4716-a7fd-819a58cea057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentMember_698716af-ed45-4e36-84c1-046c1d6dc3aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_462e3d0d-262d-482f-ac7a-1975b27f285e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentMember_698716af-ed45-4e36-84c1-046c1d6dc3aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_2186bbe5-b079-4e25-9ef2-311d4b9ef292" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_462e3d0d-262d-482f-ac7a-1975b27f285e" xlink:to="loc_us-gaap_OtherAssetsMember_2186bbe5-b079-4e25-9ef2-311d4b9ef292" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
