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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:ed1dfc56-a99b-4a3a-9b69-f149b4de7aa4,g:17fe26bd-c728-4a7b-85e9-7c01394d16f2-->
<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-20220630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS" xlink:type="extended" id="icf219df1b04545b68443a6bf69883559_CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" 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_8d760966-0971-4579-8be7-38294b39c644" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_8d760966-0971-4579-8be7-38294b39c644" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_754fa464-c106-4c4d-934c-e29e6217e7a6" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_754fa464-c106-4c4d-934c-e29e6217e7a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_ca387ad9-db2e-4146-979f-b9da27728ff3" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_ca387ad9-db2e-4146-979f-b9da27728ff3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_c68cf8af-7d97-425d-a372-c08e684853f9" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_c68cf8af-7d97-425d-a372-c08e684853f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_675668d0-e15a-4693-80fe-099dbd33910e" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_675668d0-e15a-4693-80fe-099dbd33910e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_91b4e8e4-b04a-4b62-addf-26c5d638146c" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_GainLossOnInvestments_91b4e8e4-b04a-4b62-addf-26c5d638146c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_6622c2c0-2c08-4de4-bc2c-9d3503175ccf" 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_dd6bc521-ebc2-4dbd-b74c-ea19eed64856" xlink:to="loc_us-gaap_StatementTable_6622c2c0-2c08-4de4-bc2c-9d3503175ccf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_396552d1-3e7b-4669-80a3-82db136462e2" 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_6622c2c0-2c08-4de4-bc2c-9d3503175ccf" xlink:to="loc_srt_ProductOrServiceAxis_396552d1-3e7b-4669-80a3-82db136462e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_396552d1-3e7b-4669-80a3-82db136462e2_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_396552d1-3e7b-4669-80a3-82db136462e2" xlink:to="loc_srt_ProductsAndServicesDomain_396552d1-3e7b-4669-80a3-82db136462e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_153ecb28-a618-4add-9254-84e8bd46efd1" 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_396552d1-3e7b-4669-80a3-82db136462e2" xlink:to="loc_srt_ProductsAndServicesDomain_153ecb28-a618-4add-9254-84e8bd46efd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetManagement1Member_b6ac60f7-21f0-45cf-b750-1e36db2a5de2" 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_153ecb28-a618-4add-9254-84e8bd46efd1" xlink:to="loc_us-gaap_AssetManagement1Member_b6ac60f7-21f0-45cf-b750-1e36db2a5de2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentPerformanceMember_a2355572-e810-44c1-ad9d-78fe69c12f34" 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_153ecb28-a618-4add-9254-84e8bd46efd1" xlink:to="loc_us-gaap_InvestmentPerformanceMember_a2355572-e810-44c1-ad9d-78fe69c12f34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_6f80aa3e-8a58-4d81-9bbf-83a4366e0602" 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_153ecb28-a618-4add-9254-84e8bd46efd1" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_6f80aa3e-8a58-4d81-9bbf-83a4366e0602" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustPerformanceBasedFeesMember_d08a7c91-3c6d-4486-b1a1-53ef5628ddef" xlink:href="whg-20220630.xsd#whg_TrustPerformanceBasedFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_153ecb28-a618-4add-9254-84e8bd46efd1" xlink:to="loc_whg_TrustPerformanceBasedFeesMember_d08a7c91-3c6d-4486-b1a1-53ef5628ddef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_6f98d365-8d66-4b41-aff9-b0cb074fe350" 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_6622c2c0-2c08-4de4-bc2c-9d3503175ccf" xlink:to="loc_srt_StatementScenarioAxis_6f98d365-8d66-4b41-aff9-b0cb074fe350" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_6f98d365-8d66-4b41-aff9-b0cb074fe350_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_6f98d365-8d66-4b41-aff9-b0cb074fe350" xlink:to="loc_srt_ScenarioUnspecifiedDomain_6f98d365-8d66-4b41-aff9-b0cb074fe350_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_31f3fc4f-e380-446b-ae7c-83be9a6f36cf" 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_6f98d365-8d66-4b41-aff9-b0cb074fe350" xlink:to="loc_srt_ScenarioUnspecifiedDomain_31f3fc4f-e380-446b-ae7c-83be9a6f36cf" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="whg-20220630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="extended" id="i3f0cc3120c134e0f88f444be21bc47da_CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" 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_f6d4e4df-cca9-46f1-b07f-34d5b17c089e" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_StockholdersEquity_f6d4e4df-cca9-46f1-b07f-34d5b17c089e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_b1ff4211-1328-418d-a6c0-3a3175aefee9" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_b1ff4211-1328-418d-a6c0-3a3175aefee9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_285a2c3f-f317-4f6b-b999-47efe58d434b" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_NetIncomeLoss_285a2c3f-f317-4f6b-b999-47efe58d434b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_cd8efd54-c804-49d8-a91b-a4814ad9b2df" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_cd8efd54-c804-49d8-a91b-a4814ad9b2df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_bc8c8c05-e228-417d-9588-a64758c97707" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_bc8c8c05-e228-417d-9588-a64758c97707" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_9fe9e6b0-2756-4fb4-be18-54c8a521a696" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_9fe9e6b0-2756-4fb4-be18-54c8a521a696" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_6c421aa7-4dad-416b-a145-b04404ed2bb6" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_6c421aa7-4dad-416b-a145-b04404ed2bb6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_47c1007c-0c5f-464f-a90b-05cd73e061ef" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_DividendsCommonStock_47c1007c-0c5f-464f-a90b-05cd73e061ef" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fb1d008b-019e-4465-b64e-ea1194e4ae1d" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fb1d008b-019e-4465-b64e-ea1194e4ae1d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockAwardForfeituresDividends_d548747e-f7cf-46a3-bb33-14be86494699" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_RestrictedStockAwardForfeituresDividends_d548747e-f7cf-46a3-bb33-14be86494699" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_1f4a93fd-6268-4645-af60-de9dad529dd5" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_1f4a93fd-6268-4645-af60-de9dad529dd5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_ed3441db-cfd7-40cc-9215-11b14e75f350" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_ed3441db-cfd7-40cc-9215-11b14e75f350" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TreasuryStockSharesAcquiredEmployeeStockPlan_dc1e0bcc-5617-4528-b8c3-845f91aea772" xlink:href="whg-20220630.xsd#whg_TreasuryStockSharesAcquiredEmployeeStockPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_whg_TreasuryStockSharesAcquiredEmployeeStockPlan_dc1e0bcc-5617-4528-b8c3-845f91aea772" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings_f08ef281-5a1f-4ef7-8133-2d3392e97a64" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings_f08ef281-5a1f-4ef7-8133-2d3392e97a64" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1740218e-43ee-4c66-a720-58a0297cca7a" 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_b1236caf-8256-4edf-a6a8-95980b96356e" 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_RestrictedStockValueSharesIssuedNetOfTaxWithholdings_fec53e76-2789-48eb-a111-5b56b7405bca" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings_fec53e76-2789-48eb-a111-5b56b7405bca" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_fea66319-6b2a-447b-9be0-d248e061b9b9" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_fea66319-6b2a-447b-9be0-d248e061b9b9" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ReturnOfCapital_6a5b78c1-fdbc-4a60-89b5-c46b55b16769" xlink:href="whg-20220630.xsd#whg_ReturnOfCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_whg_ReturnOfCapital_6a5b78c1-fdbc-4a60-89b5-c46b55b16769" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_a57f785b-a495-46a9-a92a-9332dd73db8b" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_a57f785b-a495-46a9-a92a-9332dd73db8b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TreasuryStockValueAcquiredCostMethodEmployeeStockPlan_00fae632-67d1-4b4f-b3d7-4a50bd39b9c4" xlink:href="whg-20220630.xsd#whg_TreasuryStockValueAcquiredCostMethodEmployeeStockPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_whg_TreasuryStockValueAcquiredCostMethodEmployeeStockPlan_00fae632-67d1-4b4f-b3d7-4a50bd39b9c4" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_74daa289-aca6-43fa-b9d7-1fd4e592f739" 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_af63e6a4-cb01-49f2-a124-a6bcbcb7d22e" xlink:to="loc_us-gaap_StatementTable_74daa289-aca6-43fa-b9d7-1fd4e592f739" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_f9a8a727-534f-44a1-b78c-298ec2021ffb" 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_74daa289-aca6-43fa-b9d7-1fd4e592f739" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_f9a8a727-534f-44a1-b78c-298ec2021ffb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f9a8a727-534f-44a1-b78c-298ec2021ffb_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_f9a8a727-534f-44a1-b78c-298ec2021ffb" xlink:to="loc_us-gaap_EquityComponentDomain_f9a8a727-534f-44a1-b78c-298ec2021ffb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5825439f-3509-45d1-9701-7a8faa3de2ca" 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_f9a8a727-534f-44a1-b78c-298ec2021ffb" xlink:to="loc_us-gaap_EquityComponentDomain_5825439f-3509-45d1-9701-7a8faa3de2ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_0d7f48c7-56ed-49fe-b556-770cb347ac38" 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_5825439f-3509-45d1-9701-7a8faa3de2ca" xlink:to="loc_us-gaap_CommonStockMember_0d7f48c7-56ed-49fe-b556-770cb347ac38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_e0051164-7de9-4f14-b075-81933b96ca1e" 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_5825439f-3509-45d1-9701-7a8faa3de2ca" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_e0051164-7de9-4f14-b075-81933b96ca1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_6a68a31a-3fd4-4530-87cf-67a76fc91828" 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_5825439f-3509-45d1-9701-7a8faa3de2ca" xlink:to="loc_us-gaap_TreasuryStockMember_6a68a31a-3fd4-4530-87cf-67a76fc91828" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_48d393bc-3a50-4fb2-8a3e-87da6014e45a" 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_5825439f-3509-45d1-9701-7a8faa3de2ca" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_48d393bc-3a50-4fb2-8a3e-87da6014e45a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_397dc34f-a03c-4cfa-8c27-c1fbe7525103" 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_5825439f-3509-45d1-9701-7a8faa3de2ca" xlink:to="loc_us-gaap_RetainedEarningsMember_397dc34f-a03c-4cfa-8c27-c1fbe7525103" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/EARNINGSPERSHAREDetailsTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#EARNINGSPERSHAREDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EARNINGSPERSHAREDetailsTextual" xlink:type="extended" id="i16cc0cfa7d04461fbd0320ce5887b909_EARNINGSPERSHAREDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_13365a09-c51e-4fdb-b3ce-4bcc913770dd" 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_2477863f-8626-4ec3-b17b-03c6cc932988" 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_13365a09-c51e-4fdb-b3ce-4bcc913770dd" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_2477863f-8626-4ec3-b17b-03c6cc932988" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_db859058-9c1b-40b6-9a96-463e17d8a757" 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_13365a09-c51e-4fdb-b3ce-4bcc913770dd" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_db859058-9c1b-40b6-9a96-463e17d8a757" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3679f72c-66a5-4730-a55a-5c49f26343a8" 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_db859058-9c1b-40b6-9a96-463e17d8a757" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3679f72c-66a5-4730-a55a-5c49f26343a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3679f72c-66a5-4730-a55a-5c49f26343a8_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_3679f72c-66a5-4730-a55a-5c49f26343a8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3679f72c-66a5-4730-a55a-5c49f26343a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7faa9421-4969-47ba-9e21-2b755294d173" 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_3679f72c-66a5-4730-a55a-5c49f26343a8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7faa9421-4969-47ba-9e21-2b755294d173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_9c01fd08-58d9-49ee-af7a-5f7a4fbb5a9f" 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_7faa9421-4969-47ba-9e21-2b755294d173" xlink:to="loc_us-gaap_RestrictedStockMember_9c01fd08-58d9-49ee-af7a-5f7a4fbb5a9f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/INVESTMENTSDetails" xlink:type="simple" xlink:href="whg-20220630.xsd#INVESTMENTSDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/INVESTMENTSDetails" xlink:type="extended" id="i473fb8763602489492af34b0b835e120_INVESTMENTSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" 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_87afd0a7-5374-4d7c-b76a-8b59c3c5292d" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_87afd0a7-5374-4d7c-b76a-8b59c3c5292d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_86579da1-a4ba-4803-b3d2-80cd5201b98e" 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_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_87afd0a7-5374-4d7c-b76a-8b59c3c5292d" xlink:to="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_86579da1-a4ba-4803-b3d2-80cd5201b98e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingUnrealizedGain_ece09406-f374-4574-aa9d-e2ef02584171" 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_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_87afd0a7-5374-4d7c-b76a-8b59c3c5292d" xlink:to="loc_us-gaap_DebtSecuritiesTradingUnrealizedGain_ece09406-f374-4574-aa9d-e2ef02584171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingUnrealizedLoss_ab8e87b9-4224-47ea-90cd-a250acfcefc1" 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_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_87afd0a7-5374-4d7c-b76a-8b59c3c5292d" xlink:to="loc_us-gaap_DebtSecuritiesTradingUnrealizedLoss_ab8e87b9-4224-47ea-90cd-a250acfcefc1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_001fc98a-e6e6-4f0a-a653-072019bb5cf7" 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_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract_87afd0a7-5374-4d7c-b76a-8b59c3c5292d" xlink:to="loc_us-gaap_TradingSecuritiesDebt_001fc98a-e6e6-4f0a-a653-072019bb5cf7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiGainLossAbstract_bc3bc700-e3ab-47e2-a65b-c64babb6545e" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_EquitySecuritiesFvNiGainLossAbstract_bc3bc700-e3ab-47e2-a65b-c64babb6545e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCost_619e9666-6ac7-44c1-9ff7-8c4f4809749a" 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_EquitySecuritiesFvNiGainLossAbstract_bc3bc700-e3ab-47e2-a65b-c64babb6545e" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCost_619e9666-6ac7-44c1-9ff7-8c4f4809749a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_3ad02212-4aff-4642-833e-ab50cdf687f1" 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_EquitySecuritiesFvNiGainLossAbstract_bc3bc700-e3ab-47e2-a65b-c64babb6545e" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_3ad02212-4aff-4642-833e-ab50cdf687f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedLoss_408556f9-b2e0-4c13-95ae-73b0abc82479" 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_EquitySecuritiesFvNiGainLossAbstract_bc3bc700-e3ab-47e2-a65b-c64babb6545e" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedLoss_408556f9-b2e0-4c13-95ae-73b0abc82479" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_2dd301ef-d43b-40ec-a039-08eae8c1c04a" 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_EquitySecuritiesFvNiGainLossAbstract_bc3bc700-e3ab-47e2-a65b-c64babb6545e" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_2dd301ef-d43b-40ec-a039-08eae8c1c04a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingAndEquitySecuritiesFvNiCost_30de1f5b-d4a5-4ce5-99ec-c6bd9b4fc10b" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_DebtSecuritiesTradingAndEquitySecuritiesFvNiCost_30de1f5b-d4a5-4ce5-99ec-c6bd9b4fc10b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedGain_740b061b-f169-4438-8501-7370ca56ac8d" xlink:href="whg-20220630.xsd#whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedGain_740b061b-f169-4438-8501-7370ca56ac8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedLoss_8a4fc735-ed64-4c4c-9a35-5657b234c3e5" xlink:href="whg-20220630.xsd#whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_whg_DebtSecuritiesTradingAndEquitySecuritiesUnrealizedLoss_8a4fc735-ed64-4c4c-9a35-5657b234c3e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_c8ca626d-7015-4f1a-a189-b241969f75a2" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_TradingSecurities_c8ca626d-7015-4f1a-a189-b241969f75a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_4abc9145-e3a4-45af-a113-da0ab1cdde08" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_4abc9145-e3a4-45af-a113-da0ab1cdde08" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainOnSecurities_5324a11f-2e6c-4970-8e47-fc28cbcc39ac" 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_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_UnrealizedGainOnSecurities_5324a11f-2e6c-4970-8e47-fc28cbcc39ac" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedloss_73dc4970-8c5f-4d2e-a97f-ee3d772b3941" xlink:href="whg-20220630.xsd#whg_Investmentscarriedatfairvalueunrealizedloss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedloss_73dc4970-8c5f-4d2e-a97f-ee3d772b3941" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_0bf3da06-7ead-40b5-b4fc-77ad8ba1c00d" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_0bf3da06-7ead-40b5-b4fc-77ad8ba1c00d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedgain_b9fd9a12-d3ce-4340-b88d-ff1c3947d7f9" xlink:href="whg-20220630.xsd#whg_Investmentscarriedatfairvalueunrealizedgain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedgain_b9fd9a12-d3ce-4340-b88d-ff1c3947d7f9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_279d7fca-9bfa-423d-afb6-5d692d342f2f" xlink:href="whg-20220630.xsd#whg_UnrealizedGainsLossesOnPrivateInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_279d7fca-9bfa-423d-afb6-5d692d342f2f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedLossOnSecurities_d6550ac5-7497-4ce4-ab00-54d71a232657" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrealizedLossOnSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_UnrealizedLossOnSecurities_d6550ac5-7497-4ce4-ab00-54d71a232657" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostMethodInvestments_34368324-f05a-4105-b57e-d5e7e251cef1" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_CostMethodInvestments_34368324-f05a-4105-b57e-d5e7e251cef1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_46b14b84-5478-4ab0-a688-622ddaa7f316" 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_151a9c09-1144-43fe-be61-aa1cc491b6dc" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_46b14b84-5478-4ab0-a688-622ddaa7f316" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_6586ab05-612b-4bdd-bd22-e1383dc178ef" 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_46b14b84-5478-4ab0-a688-622ddaa7f316" xlink:to="loc_us-gaap_InvestmentTypeAxis_6586ab05-612b-4bdd-bd22-e1383dc178ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_6586ab05-612b-4bdd-bd22-e1383dc178ef_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_6586ab05-612b-4bdd-bd22-e1383dc178ef" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_6586ab05-612b-4bdd-bd22-e1383dc178ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" 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_6586ab05-612b-4bdd-bd22-e1383dc178ef" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_13e2e347-3f65-4599-bd28-08238b381df3" 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_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_13e2e347-3f65-4599-bd28-08238b381df3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_73648ba8-7fa5-4461-bc07-1492eb42b060" 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_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_us-gaap_MoneyMarketFundsMember_73648ba8-7fa5-4461-bc07-1492eb42b060" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityFundsMember_5d0d0e16-3735-4006-a462-370152edeb76" 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_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_us-gaap_EquityFundsMember_5d0d0e16-3735-4006-a462-370152edeb76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_720ee0ec-e9d3-48f2-af2d-204ca516fa05" 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_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_us-gaap_PrivateEquityFundsMember_720ee0ec-e9d3-48f2-af2d-204ca516fa05" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_4925f1b9-e985-47b3-951c-3ead32d7eb20" xlink:href="whg-20220630.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_whg_PrivateEquityInvestmentsMember_4925f1b9-e985-47b3-951c-3ead32d7eb20" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_8a260203-a792-48c8-8771-bd56cab86cc7" 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_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_us-gaap_EquitySecuritiesMember_8a260203-a792-48c8-8771-bd56cab86cc7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UsGaap_EquitySecuritiesMemberMember_67cc2457-1e3c-4201-a971-ddaf2e81abac" xlink:href="whg-20220630.xsd#whg_UsGaap_EquitySecuritiesMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cbe5fcbc-537e-4234-a7b6-b4c7c0f42130" xlink:to="loc_whg_UsGaap_EquitySecuritiesMemberMember_67cc2457-1e3c-4201-a971-ddaf2e81abac" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/INVESTMENTSDetailsTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#INVESTMENTSDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/INVESTMENTSDetailsTextual" xlink:type="extended" id="ife110f5a88f64377a238cb41df9bc754_INVESTMENTSDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" 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_6bcac51c-9642-4fbb-bae8-f779cc8ee620" 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_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_us-gaap_LongTermInvestments_6bcac51c-9642-4fbb-bae8-f779cc8ee620" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_d81b6157-e5db-44b4-940f-a54f36c4198e" 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_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_us-gaap_TradingSecurities_d81b6157-e5db-44b4-940f-a54f36c4198e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainOnSecurities_fff43d2c-0c58-4bd0-9cb8-caeaa6d7fd2d" 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_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_us-gaap_UnrealizedGainOnSecurities_fff43d2c-0c58-4bd0-9cb8-caeaa6d7fd2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_3384ea4e-b7a9-45e1-8518-13d31fbc85a1" 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_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_us-gaap_GainLossOnInvestments_3384ea4e-b7a9-45e1-8518-13d31fbc85a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedgain_ee75042d-5f38-43c9-b45a-1a2e48352189" xlink:href="whg-20220630.xsd#whg_Investmentscarriedatfairvalueunrealizedgain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedgain_ee75042d-5f38-43c9-b45a-1a2e48352189" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_7de6b575-229e-4690-b7f3-df42f8d86302" 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_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_7de6b575-229e-4690-b7f3-df42f8d86302" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_7de89d6f-41c2-4e8e-a1e6-8de8cdf2d16c" xlink:href="whg-20220630.xsd#whg_UnrealizedGainsLossesOnPrivateInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_whg_UnrealizedGainsLossesOnPrivateInvestments_7de89d6f-41c2-4e8e-a1e6-8de8cdf2d16c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_9503baa8-730e-4315-9c5b-912f460ed8e6" 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_ba9070a3-fdf7-40a0-b115-e3285ed7be1f" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_9503baa8-730e-4315-9c5b-912f460ed8e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_8e1d8ee6-15a6-4f1c-bf1e-a362f19d3b8c" 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_9503baa8-730e-4315-9c5b-912f460ed8e6" xlink:to="loc_srt_ConsolidatedEntitiesAxis_8e1d8ee6-15a6-4f1c-bf1e-a362f19d3b8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_8e1d8ee6-15a6-4f1c-bf1e-a362f19d3b8c_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_8e1d8ee6-15a6-4f1c-bf1e-a362f19d3b8c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_8e1d8ee6-15a6-4f1c-bf1e-a362f19d3b8c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_aea80bc7-39ac-4c97-8f1b-8db96551d404" 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_8e1d8ee6-15a6-4f1c-bf1e-a362f19d3b8c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_aea80bc7-39ac-4c97-8f1b-8db96551d404" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_VariableInterestEntityMember_47cbaef4-59e2-4df0-9fd2-816a91830c66" xlink:href="whg-20220630.xsd#whg_VariableInterestEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_aea80bc7-39ac-4c97-8f1b-8db96551d404" xlink:to="loc_whg_VariableInterestEntityMember_47cbaef4-59e2-4df0-9fd2-816a91830c66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_6a34b5c6-3aea-4657-9a28-8ab7e544e8bd" 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_9503baa8-730e-4315-9c5b-912f460ed8e6" xlink:to="loc_us-gaap_InvestmentTypeAxis_6a34b5c6-3aea-4657-9a28-8ab7e544e8bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_6a34b5c6-3aea-4657-9a28-8ab7e544e8bd_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_6a34b5c6-3aea-4657-9a28-8ab7e544e8bd" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_6a34b5c6-3aea-4657-9a28-8ab7e544e8bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_3aeda35f-fd26-42b5-aac6-3b541594c13c" 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_6a34b5c6-3aea-4657-9a28-8ab7e544e8bd" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_3aeda35f-fd26-42b5-aac6-3b541594c13c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UsGaap_EquitySecuritiesMemberMember_9f3c4dec-e30a-4d35-b7e4-37548eed779b" xlink:href="whg-20220630.xsd#whg_UsGaap_EquitySecuritiesMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_3aeda35f-fd26-42b5-aac6-3b541594c13c" xlink:to="loc_whg_UsGaap_EquitySecuritiesMemberMember_9f3c4dec-e30a-4d35-b7e4-37548eed779b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/FAIRVALUEMEASUREMENTSDetails" xlink:type="simple" xlink:href="whg-20220630.xsd#FAIRVALUEMEASUREMENTSDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/FAIRVALUEMEASUREMENTSDetails" xlink:type="extended" id="ic6e61f8c29524525b15d0feabf10e9dd_FAIRVALUEMEASUREMENTSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d31bda87-a6ab-4367-91ea-f8dcb024074e" 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_a564e233-515d-42de-b2c9-48135055233d" 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_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_a564e233-515d-42de-b2c9-48135055233d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_c28081aa-96a3-4180-94a2-2a0b2314f481" 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_a564e233-515d-42de-b2c9-48135055233d" xlink:to="loc_us-gaap_TradingSecuritiesDebt_c28081aa-96a3-4180-94a2-2a0b2314f481" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_6c05f78d-08f8-46fb-9cdf-950631ba1e48" 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_a564e233-515d-42de-b2c9-48135055233d" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_6c05f78d-08f8-46fb-9cdf-950631ba1e48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_cd224ca4-6b62-46f9-affa-a7a3313b1377" 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_a564e233-515d-42de-b2c9-48135055233d" xlink:to="loc_us-gaap_TradingSecurities_cd224ca4-6b62-46f9-affa-a7a3313b1377" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_c6648813-d473-412c-b155-ddbfda60c767" 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_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_c6648813-d473-412c-b155-ddbfda60c767" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_84f6cd2d-577c-4293-9893-86db8415a489" 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_c6648813-d473-412c-b155-ddbfda60c767" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_84f6cd2d-577c-4293-9893-86db8415a489" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_e08aaca1-769b-43b3-88d0-28ad7c89a529" 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_c6648813-d473-412c-b155-ddbfda60c767" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_e08aaca1-769b-43b3-88d0-28ad7c89a529" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_8570ed06-31d7-4cf6-b975-697c5ead6245" 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_912df145-edec-416e-9c46-31c176cbc1a7" 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_c6648813-d473-412c-b155-ddbfda60c767" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease_912df145-edec-416e-9c46-31c176cbc1a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_FairValueInputsAbstract_4a2fce0f-8ddb-4d58-921c-6f4770e2eecc" xlink:href="whg-20220630.xsd#whg_FairValueInputsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_whg_FairValueInputsAbstract_4a2fce0f-8ddb-4d58-921c-6f4770e2eecc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_07d66a91-88cf-4897-9e9a-0de003156ddb" 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_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_07d66a91-88cf-4897-9e9a-0de003156ddb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputBookValueMultipleMinimum_467f5c0e-3af2-4974-bea5-9dcdd2777cf3" xlink:href="whg-20220630.xsd#whg_UnobservableInputBookValueMultipleMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_whg_UnobservableInputBookValueMultipleMinimum_467f5c0e-3af2-4974-bea5-9dcdd2777cf3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputBookValueMultipleMaximum_1ddadf80-f4da-4c25-8fed-e55e9210da37" xlink:href="whg-20220630.xsd#whg_UnobservableInputBookValueMultipleMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_whg_UnobservableInputBookValueMultipleMaximum_1ddadf80-f4da-4c25-8fed-e55e9210da37" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UnobservableInputBookValueMultipleWeightedAverage_8fd5ee97-46df-40a9-88e4-27ce3efc5d85" xlink:href="whg-20220630.xsd#whg_UnobservableInputBookValueMultipleWeightedAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_whg_UnobservableInputBookValueMultipleWeightedAverage_8fd5ee97-46df-40a9-88e4-27ce3efc5d85" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_cc79fd71-0729-4251-8c88-720c3c0570cd" 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_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_us-gaap_LongTermInvestments_cc79fd71-0729-4251-8c88-720c3c0570cd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6c1b691d-a8a0-48e7-9cd6-ca13848b91d3" 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_d31bda87-a6ab-4367-91ea-f8dcb024074e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6c1b691d-a8a0-48e7-9cd6-ca13848b91d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_e4f18ef6-1359-436b-81ca-1569248a11ad" 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_6c1b691d-a8a0-48e7-9cd6-ca13848b91d3" xlink:to="loc_us-gaap_InvestmentTypeAxis_e4f18ef6-1359-436b-81ca-1569248a11ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_e4f18ef6-1359-436b-81ca-1569248a11ad_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_e4f18ef6-1359-436b-81ca-1569248a11ad" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_e4f18ef6-1359-436b-81ca-1569248a11ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_cbbc2fe1-bbf6-44eb-acc8-1d9f20b5a8e1" 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_e4f18ef6-1359-436b-81ca-1569248a11ad" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_cbbc2fe1-bbf6-44eb-acc8-1d9f20b5a8e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_937b6263-2ce0-479b-99fd-3ed542fc0de3" 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_cbbc2fe1-bbf6-44eb-acc8-1d9f20b5a8e1" xlink:to="loc_us-gaap_PrivateEquityFundsMember_937b6263-2ce0-479b-99fd-3ed542fc0de3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_c21af177-adf5-4533-8862-3627fb65097d" xlink:href="whg-20220630.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cbbc2fe1-bbf6-44eb-acc8-1d9f20b5a8e1" xlink:to="loc_whg_PrivateEquityInvestmentsMember_c21af177-adf5-4533-8862-3627fb65097d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_064289e9-5489-4c18-bcfa-d493ec143f58" 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_6c1b691d-a8a0-48e7-9cd6-ca13848b91d3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_064289e9-5489-4c18-bcfa-d493ec143f58" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_064289e9-5489-4c18-bcfa-d493ec143f58_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_064289e9-5489-4c18-bcfa-d493ec143f58" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_064289e9-5489-4c18-bcfa-d493ec143f58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_67c80acc-9934-4d36-a725-64c722ac8e14" 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_064289e9-5489-4c18-bcfa-d493ec143f58" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_67c80acc-9934-4d36-a725-64c722ac8e14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_bfb071b5-ca03-4f24-a6b5-b75d5bc9c216" 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_67c80acc-9934-4d36-a725-64c722ac8e14" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_bfb071b5-ca03-4f24-a6b5-b75d5bc9c216" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_479e4a6c-7778-42ef-86c3-f0cf491d1f87" 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_67c80acc-9934-4d36-a725-64c722ac8e14" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_479e4a6c-7778-42ef-86c3-f0cf491d1f87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_d4ca50e3-819a-4790-97d8-a06279f5dddc" 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_67c80acc-9934-4d36-a725-64c722ac8e14" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_d4ca50e3-819a-4790-97d8-a06279f5dddc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_124b1cd5-cfa9-4645-b06e-0c37aceac9e3" 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_67c80acc-9934-4d36-a725-64c722ac8e14" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_124b1cd5-cfa9-4645-b06e-0c37aceac9e3" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetailsTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#VARIABLEINTERESTENTITIESDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetailsTextual" xlink:type="extended" id="if66c61a80896413ca354785b98ad2352_VARIABLEINTERESTENTITIESDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_7bfd72f3-30ea-42d7-a51c-0862e30d78b0" 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_b9927c5c-0a54-44a2-a606-b6cc5289b6b3" 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_7bfd72f3-30ea-42d7-a51c-0862e30d78b0" xlink:to="loc_us-gaap_TradingSecurities_b9927c5c-0a54-44a2-a606-b6cc5289b6b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_1baf61c0-bd51-48d4-9aac-a5cfdfac42bb" 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_7bfd72f3-30ea-42d7-a51c-0862e30d78b0" xlink:to="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_1baf61c0-bd51-48d4-9aac-a5cfdfac42bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_8299dd69-d4db-432a-8d2e-caab5713f062" 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_7bfd72f3-30ea-42d7-a51c-0862e30d78b0" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_8299dd69-d4db-432a-8d2e-caab5713f062" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_c43d9316-8e8d-49d8-a6c3-7bde60ea42a3" 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_7bfd72f3-30ea-42d7-a51c-0862e30d78b0" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_c43d9316-8e8d-49d8-a6c3-7bde60ea42a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_d009e0ee-6e53-4d53-87cc-3bae4add878c" 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_c43d9316-8e8d-49d8-a6c3-7bde60ea42a3" xlink:to="loc_srt_ConsolidatedEntitiesAxis_d009e0ee-6e53-4d53-87cc-3bae4add878c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_d009e0ee-6e53-4d53-87cc-3bae4add878c_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_d009e0ee-6e53-4d53-87cc-3bae4add878c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_d009e0ee-6e53-4d53-87cc-3bae4add878c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1fd428ce-3dff-4010-92f8-513bfcb6757f" 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_d009e0ee-6e53-4d53-87cc-3bae4add878c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1fd428ce-3dff-4010-92f8-513bfcb6757f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_VariableInterestEntityMember_eeb475ec-6d56-4997-99da-f65c71685efa" xlink:href="whg-20220630.xsd#whg_VariableInterestEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1fd428ce-3dff-4010-92f8-513bfcb6757f" xlink:to="loc_whg_VariableInterestEntityMember_eeb475ec-6d56-4997-99da-f65c71685efa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CommonTrustFundsMember_96c5382b-5f7d-4bb3-adb6-aa6806ef1b0f" xlink:href="whg-20220630.xsd#whg_CommonTrustFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1fd428ce-3dff-4010-92f8-513bfcb6757f" xlink:to="loc_whg_CommonTrustFundsMember_96c5382b-5f7d-4bb3-adb6-aa6806ef1b0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_0386cafb-fa26-4ca9-8791-ac4543aad4ac" xlink:href="whg-20220630.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1fd428ce-3dff-4010-92f8-513bfcb6757f" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_0386cafb-fa26-4ca9-8791-ac4543aad4ac" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetails" xlink:type="simple" xlink:href="whg-20220630.xsd#VARIABLEINTERESTENTITIESDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VARIABLEINTERESTENTITIESDetails" xlink:type="extended" id="icb178c682c574eafaa359e49150f132b_VARIABLEINTERESTENTITIESDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_8fe1c5dd-2d8e-44ca-a141-0c88ccecc6cd" 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_fbb94f9f-3574-4422-bd20-7d6f0b065b40" 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_8fe1c5dd-2d8e-44ca-a141-0c88ccecc6cd" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_fbb94f9f-3574-4422-bd20-7d6f0b065b40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsUnderManagementCarryingAmount_c0ab664f-2c4b-4230-a6d0-5a45c6b9ac6d" 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_fbb94f9f-3574-4422-bd20-7d6f0b065b40" xlink:to="loc_us-gaap_AssetsUnderManagementCarryingAmount_c0ab664f-2c4b-4230-a6d0-5a45c6b9ac6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_4f839220-d4f4-4252-9c96-593942f99ec6" 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_fbb94f9f-3574-4422-bd20-7d6f0b065b40" xlink:to="loc_us-gaap_TradingSecurities_4f839220-d4f4-4252-9c96-593942f99ec6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RiskOfLoss_6eb1f692-cd0c-42b8-a999-f9c9e357e84a" xlink:href="whg-20220630.xsd#whg_RiskOfLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_fbb94f9f-3574-4422-bd20-7d6f0b065b40" xlink:to="loc_whg_RiskOfLoss_6eb1f692-cd0c-42b8-a999-f9c9e357e84a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent_fe570130-1706-401e-8cce-68e24adb8de1" 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_8fe1c5dd-2d8e-44ca-a141-0c88ccecc6cd" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent_fe570130-1706-401e-8cce-68e24adb8de1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_850b84ca-d1cd-430e-92d8-a732569cbc93" 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_8fe1c5dd-2d8e-44ca-a141-0c88ccecc6cd" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_850b84ca-d1cd-430e-92d8-a732569cbc93" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_68bbc826-2d20-4222-98bf-7b2c19c1fa7b" 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_850b84ca-d1cd-430e-92d8-a732569cbc93" xlink:to="loc_srt_ConsolidatedEntitiesAxis_68bbc826-2d20-4222-98bf-7b2c19c1fa7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_68bbc826-2d20-4222-98bf-7b2c19c1fa7b_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_68bbc826-2d20-4222-98bf-7b2c19c1fa7b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_68bbc826-2d20-4222-98bf-7b2c19c1fa7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" 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_68bbc826-2d20-4222-98bf-7b2c19c1fa7b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_WestwoodFundsMember_51ad8202-b99c-4a42-903d-d21c7c66fb0f" xlink:href="whg-20220630.xsd#whg_WestwoodFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_WestwoodFundsMember_51ad8202-b99c-4a42-903d-d21c7c66fb0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CommonTrustFundsMember_0f024c8f-890b-41ef-abd8-e2cf07208037" xlink:href="whg-20220630.xsd#whg_CommonTrustFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_CommonTrustFundsMember_0f024c8f-890b-41ef-abd8-e2cf07208037" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_305ab68c-b840-4107-b2ca-20a9552a20ab" xlink:href="whg-20220630.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_305ab68c-b840-4107-b2ca-20a9552a20ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_WestwoodHospitalityFundILLCMember_85d90ba3-1a20-4c41-8fd8-5f1b09949bbc" xlink:href="whg-20220630.xsd#whg_WestwoodHospitalityFundILLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_WestwoodHospitalityFundILLCMember_85d90ba3-1a20-4c41-8fd8-5f1b09949bbc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_4004d386-a66b-48e1-9373-bd6e3950ce57" xlink:href="whg-20220630.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_PrivateEquityInvestmentsMember_4004d386-a66b-48e1-9373-bd6e3950ce57" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateWealthMember_8e91c84f-60fe-4926-a93e-68368523f59e" xlink:href="whg-20220630.xsd#whg_PrivateWealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_PrivateWealthMember_8e91c84f-60fe-4926-a93e-68368523f59e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_InstitutionalMember_f803a72a-9fec-487a-ab45-4a1283a66dc5" xlink:href="whg-20220630.xsd#whg_InstitutionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_f0d363f3-7a0b-4b0e-a3ee-12bd92f30ef0" xlink:to="loc_whg_InstitutionalMember_f803a72a-9fec-487a-ab45-4a1283a66dc5" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="whg-20220630.xsd#REVENUEDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="extended" id="ib1cf5d78610845c78d172aa540520d6f_REVENUEDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_faf1cea9-ed92-4c92-8832-85d1587b5955" 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_cc79a701-36ae-43c3-b410-135a27781fa7" 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_faf1cea9-ed92-4c92-8832-85d1587b5955" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_cc79a701-36ae-43c3-b410-135a27781fa7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_28a417a3-a361-4424-a866-54403d0625d3" 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_faf1cea9-ed92-4c92-8832-85d1587b5955" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_28a417a3-a361-4424-a866-54403d0625d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_4f5374a2-943f-4fc9-acfd-6f0aca4d250e" 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_28a417a3-a361-4424-a866-54403d0625d3" xlink:to="loc_srt_ProductOrServiceAxis_4f5374a2-943f-4fc9-acfd-6f0aca4d250e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_4f5374a2-943f-4fc9-acfd-6f0aca4d250e_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_4f5374a2-943f-4fc9-acfd-6f0aca4d250e" xlink:to="loc_srt_ProductsAndServicesDomain_4f5374a2-943f-4fc9-acfd-6f0aca4d250e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" 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_4f5374a2-943f-4fc9-acfd-6f0aca4d250e" xlink:to="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_InvestmentAdvisoryServicesMember_a5a99b75-6b1c-4fe0-bc25-47da36b63aa4" xlink:href="whg-20220630.xsd#whg_InvestmentAdvisoryServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_InvestmentAdvisoryServicesMember_a5a99b75-6b1c-4fe0-bc25-47da36b63aa4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_MutualFundAdvisoryMemberMember_220b58a1-c2ff-400d-a1c6-08a2075844f1" xlink:href="whg-20220630.xsd#whg_MutualFundAdvisoryMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_MutualFundAdvisoryMemberMember_220b58a1-c2ff-400d-a1c6-08a2075844f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateWealthAdvisoryMember_1b012c67-0387-4a36-bfad-28323c7f3f94" xlink:href="whg-20220630.xsd#whg_PrivateWealthAdvisoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_PrivateWealthAdvisoryMember_1b012c67-0387-4a36-bfad-28323c7f3f94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PerformancefeeMember_9fe0320e-4cff-4069-97be-e0c028579ba9" xlink:href="whg-20220630.xsd#whg_PerformancefeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_PerformancefeeMember_9fe0320e-4cff-4069-97be-e0c028579ba9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustFeeMember_718c4d68-31c6-4cb5-80c8-21d042a9e16a" xlink:href="whg-20220630.xsd#whg_TrustFeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_TrustFeeMember_718c4d68-31c6-4cb5-80c8-21d042a9e16a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_OtherRevenueMiscServicesMember_18ca8ecf-5fcb-4d94-b6bd-8107d7a01200" xlink:href="whg-20220630.xsd#whg_OtherRevenueMiscServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_OtherRevenueMiscServicesMember_18ca8ecf-5fcb-4d94-b6bd-8107d7a01200" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustPerformanceBasedMember_50be8815-4cfb-4469-a0ea-5463e66e111c" xlink:href="whg-20220630.xsd#whg_TrustPerformanceBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_20489228-8966-421e-9f89-c43e34097beb" xlink:to="loc_whg_TrustPerformanceBasedMember_50be8815-4cfb-4469-a0ea-5463e66e111c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5b1a59b2-2e8a-4772-8fe5-92fc49ad28c4" 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_28a417a3-a361-4424-a866-54403d0625d3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5b1a59b2-2e8a-4772-8fe5-92fc49ad28c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5b1a59b2-2e8a-4772-8fe5-92fc49ad28c4_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_5b1a59b2-2e8a-4772-8fe5-92fc49ad28c4" xlink:to="loc_us-gaap_SegmentDomain_5b1a59b2-2e8a-4772-8fe5-92fc49ad28c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_448442d7-8f49-4e6e-804d-a75454d85e5f" 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_5b1a59b2-2e8a-4772-8fe5-92fc49ad28c4" xlink:to="loc_us-gaap_SegmentDomain_448442d7-8f49-4e6e-804d-a75454d85e5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustMember_53918f46-2caf-439f-bfdd-a1c5015cc1b5" xlink:href="whg-20220630.xsd#whg_TrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_448442d7-8f49-4e6e-804d-a75454d85e5f" xlink:to="loc_whg_TrustMember_53918f46-2caf-439f-bfdd-a1c5015cc1b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_AdvisoryMember_26817fd3-0dd2-485e-8335-a0bef8ef023d" xlink:href="whg-20220630.xsd#whg_AdvisoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_448442d7-8f49-4e6e-804d-a75454d85e5f" xlink:to="loc_whg_AdvisoryMember_26817fd3-0dd2-485e-8335-a0bef8ef023d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_1d9ad0e8-4881-48fd-94b2-45eb76641576" 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_28a417a3-a361-4424-a866-54403d0625d3" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_1d9ad0e8-4881-48fd-94b2-45eb76641576" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_1d9ad0e8-4881-48fd-94b2-45eb76641576_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_1d9ad0e8-4881-48fd-94b2-45eb76641576" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_1d9ad0e8-4881-48fd-94b2-45eb76641576_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_ef4c0369-03db-4a42-81ff-f57bf61241e8" 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_1d9ad0e8-4881-48fd-94b2-45eb76641576" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_ef4c0369-03db-4a42-81ff-f57bf61241e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_3edbe3df-4789-4d98-94be-b1a60c87ba43" 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_28a417a3-a361-4424-a866-54403d0625d3" xlink:to="loc_srt_StatementGeographicalAxis_3edbe3df-4789-4d98-94be-b1a60c87ba43" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_3edbe3df-4789-4d98-94be-b1a60c87ba43_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_3edbe3df-4789-4d98-94be-b1a60c87ba43" xlink:to="loc_srt_SegmentGeographicalDomain_3edbe3df-4789-4d98-94be-b1a60c87ba43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_f490c9c7-be2f-4fee-849b-a9e2876ad77d" 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_3edbe3df-4789-4d98-94be-b1a60c87ba43" xlink:to="loc_srt_SegmentGeographicalDomain_f490c9c7-be2f-4fee-849b-a9e2876ad77d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_7e7102ee-6433-4237-b557-ab76486be140" 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_f490c9c7-be2f-4fee-849b-a9e2876ad77d" xlink:to="loc_srt_EuropeMember_7e7102ee-6433-4237-b557-ab76486be140" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_52002429-e5b4-4a60-b133-eaf41fdf764d" 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_f490c9c7-be2f-4fee-849b-a9e2876ad77d" xlink:to="loc_country_CA_52002429-e5b4-4a60-b133-eaf41fdf764d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_67d9521e-bee8-4fdc-98ce-0806c98a0e40" 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_f490c9c7-be2f-4fee-849b-a9e2876ad77d" xlink:to="loc_country_US_67d9521e-bee8-4fdc-98ce-0806c98a0e40" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONTables" xlink:type="simple" xlink:href="whg-20220630.xsd#LONGTERMINCENTIVECOMPENSATIONTables"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONTables" xlink:type="extended" id="i7780a622bc9a4edda1a8510327ab3ec6_LONGTERMINCENTIVECOMPENSATIONTables">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88350038-f44e-4eba-a1d6-ca9ad0e1a2cd" 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_cac677ae-cbb5-4386-8648-ede4450c0955" xlink:href="whg-20220630.xsd#whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88350038-f44e-4eba-a1d6-ca9ad0e1a2cd" xlink:to="loc_whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock_cac677ae-cbb5-4386-8648-ede4450c0955" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_da82ba86-8c8e-4b75-95fd-d9d674689e3f" 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_88350038-f44e-4eba-a1d6-ca9ad0e1a2cd" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_da82ba86-8c8e-4b75-95fd-d9d674689e3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_be0b39b1-47c0-4434-a1e7-4e251843ad63" 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_88350038-f44e-4eba-a1d6-ca9ad0e1a2cd" xlink:to="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_be0b39b1-47c0-4434-a1e7-4e251843ad63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock_25c4d4f9-98e4-47dc-a8f6-293159f3fed7" xlink:href="whg-20220630.xsd#whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88350038-f44e-4eba-a1d6-ca9ad0e1a2cd" xlink:to="loc_whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock_25c4d4f9-98e4-47dc-a8f6-293159f3fed7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_53da66d7-e317-4855-b4e9-d301060f500d" 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_88350038-f44e-4eba-a1d6-ca9ad0e1a2cd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_53da66d7-e317-4855-b4e9-d301060f500d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e45301cd-3090-48c3-817b-12eb695fd970" 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_53da66d7-e317-4855-b4e9-d301060f500d" xlink:to="loc_us-gaap_AwardTypeAxis_e45301cd-3090-48c3-817b-12eb695fd970" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e45301cd-3090-48c3-817b-12eb695fd970_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_e45301cd-3090-48c3-817b-12eb695fd970" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e45301cd-3090-48c3-817b-12eb695fd970_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5723b67c-f96f-481c-a63c-0942db0f4f28" 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_e45301cd-3090-48c3-817b-12eb695fd970" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5723b67c-f96f-481c-a63c-0942db0f4f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedStockSubjectOnlyToServiceConditionMember_70122b88-3218-4009-acdf-64ae8f4460e0" xlink:href="whg-20220630.xsd#whg_RestrictedStockSubjectOnlyToServiceConditionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5723b67c-f96f-481c-a63c-0942db0f4f28" xlink:to="loc_whg_RestrictedStockSubjectOnlyToServiceConditionMember_70122b88-3218-4009-acdf-64ae8f4460e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_a81bcc1b-a48e-4035-81cb-f3293cce9f4d" xlink:href="whg-20220630.xsd#whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5723b67c-f96f-481c-a63c-0942db0f4f28" xlink:to="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_a81bcc1b-a48e-4035-81cb-f3293cce9f4d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetailsTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#LONGTERMINCENTIVECOMPENSATIONDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetailsTextual" xlink:type="extended" id="ie40971989c304177ac2f74c793bb64aa_LONGTERMINCENTIVECOMPENSATIONDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a0628da0-4df6-4a77-affe-a3794a990a3b" 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_ecad3f98-2ee7-49fb-9923-5c5f320f4c7d" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ecad3f98-2ee7-49fb-9923-5c5f320f4c7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_d7d22dea-0c40-405d-9fe2-cdf004acd20d" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_d7d22dea-0c40-405d-9fe2-cdf004acd20d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal_c50bb79c-b844-4581-abd8-d09b3f758f4c" xlink:href="whg-20220630.xsd#whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal_c50bb79c-b844-4581-abd8-d09b3f758f4c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_FundPurchasesOfCommonStock_a3c9383b-9ef2-41dd-8fb0-88b20d8b3a41" xlink:href="whg-20220630.xsd#whg_FundPurchasesOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_whg_FundPurchasesOfCommonStock_a3c9383b-9ef2-41dd-8fb0-88b20d8b3a41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant_52f42233-a8ea-454d-9e77-779699b1a552" xlink:href="whg-20220630.xsd#whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant_52f42233-a8ea-454d-9e77-779699b1a552" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_e7ced563-6de6-4460-bad0-1c0eafef7198" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_SharePrice_e7ced563-6de6-4460-bad0-1c0eafef7198" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_29285aac-2ca1-48a1-8e5d-d9c5780dd5bc" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_29285aac-2ca1-48a1-8e5d-d9c5780dd5bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_93b09a46-f370-4867-aee4-597b685c73a6" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_93b09a46-f370-4867-aee4-597b685c73a6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_5af5b6ed-7dc8-42e4-b895-057eeb35cfe0" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_5af5b6ed-7dc8-42e4-b895-057eeb35cfe0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_c261da58-8afc-4c02-8c9e-9b71d6993133" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_c261da58-8afc-4c02-8c9e-9b71d6993133" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d11b7c94-31aa-4f56-aa61-9559bb97991a" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d11b7c94-31aa-4f56-aa61-9559bb97991a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_d3d96284-1d04-4ada-8740-f1249b7b7155" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_d3d96284-1d04-4ada-8740-f1249b7b7155" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_93e28282-8cbe-4ac5-af95-ededfb977bca" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_93e28282-8cbe-4ac5-af95-ededfb977bca" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_MutualFundIncentiveAwardLiability_c2f4ab63-21fd-437b-b53d-6eb819c6ffe0" xlink:href="whg-20220630.xsd#whg_MutualFundIncentiveAwardLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_whg_MutualFundIncentiveAwardLiability_c2f4ab63-21fd-437b-b53d-6eb819c6ffe0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_1f883b13-8616-4f42-8744-000db8af464b" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_1f883b13-8616-4f42-8744-000db8af464b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockAwardForfeitures_4037c66a-0529-4acf-ad4f-7ddac7c1ebb4" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_RestrictedStockAwardForfeitures_4037c66a-0529-4acf-ad4f-7ddac7c1ebb4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_e341ee14-57d7-4f79-ba6c-237e3b9f358f" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_e341ee14-57d7-4f79-ba6c-237e3b9f358f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c5e8d129-3f36-47dd-a288-30b2537001a4" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c5e8d129-3f36-47dd-a288-30b2537001a4" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_e8ab0194-6f42-459a-9c9f-5c6b6d953f55" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_e8ab0194-6f42-459a-9c9f-5c6b6d953f55" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ba246795-8f18-4e18-b414-8676c0d7d17a" 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_a0628da0-4df6-4a77-affe-a3794a990a3b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_7c359baa-ef56-4675-a788-fb13c3d9f72e" 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_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_us-gaap_VestingAxis_7c359baa-ef56-4675-a788-fb13c3d9f72e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_7c359baa-ef56-4675-a788-fb13c3d9f72e_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_7c359baa-ef56-4675-a788-fb13c3d9f72e" xlink:to="loc_us-gaap_VestingDomain_7c359baa-ef56-4675-a788-fb13c3d9f72e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_22b9c8b3-c82a-4b0d-bee1-9b0fcaf23c6d" 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_7c359baa-ef56-4675-a788-fb13c3d9f72e" xlink:to="loc_us-gaap_VestingDomain_22b9c8b3-c82a-4b0d-bee1-9b0fcaf23c6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TargetAxis_09fc40fe-0ed9-4a2c-9c85-24dc46d8f556" xlink:href="whg-20220630.xsd#whg_TargetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_whg_TargetAxis_09fc40fe-0ed9-4a2c-9c85-24dc46d8f556" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TargetDomain_09fc40fe-0ed9-4a2c-9c85-24dc46d8f556_default" xlink:href="whg-20220630.xsd#whg_TargetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_whg_TargetAxis_09fc40fe-0ed9-4a2c-9c85-24dc46d8f556" xlink:to="loc_whg_TargetDomain_09fc40fe-0ed9-4a2c-9c85-24dc46d8f556_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TargetDomain_62b00d7c-d6b4-4ea9-aebe-5dfb9f4983cf" xlink:href="whg-20220630.xsd#whg_TargetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_whg_TargetAxis_09fc40fe-0ed9-4a2c-9c85-24dc46d8f556" xlink:to="loc_whg_TargetDomain_62b00d7c-d6b4-4ea9-aebe-5dfb9f4983cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7fd130a0-915e-4798-a8c8-44b5b5b3d3e6" 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_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_srt_RangeAxis_7fd130a0-915e-4798-a8c8-44b5b5b3d3e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7fd130a0-915e-4798-a8c8-44b5b5b3d3e6_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_7fd130a0-915e-4798-a8c8-44b5b5b3d3e6" xlink:to="loc_srt_RangeMember_7fd130a0-915e-4798-a8c8-44b5b5b3d3e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a4598985-b91c-4b35-9ea8-fbb296e8e692" 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_7fd130a0-915e-4798-a8c8-44b5b5b3d3e6" xlink:to="loc_srt_RangeMember_a4598985-b91c-4b35-9ea8-fbb296e8e692" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_db40d4ff-36d6-4696-8c65-d1d3df1c5054" 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_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_us-gaap_AwardTypeAxis_db40d4ff-36d6-4696-8c65-d1d3df1c5054" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_db40d4ff-36d6-4696-8c65-d1d3df1c5054_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_db40d4ff-36d6-4696-8c65-d1d3df1c5054" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_db40d4ff-36d6-4696-8c65-d1d3df1c5054_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0df113ce-ec36-4139-b2f7-c9255b8ccb64" 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_db40d4ff-36d6-4696-8c65-d1d3df1c5054" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0df113ce-ec36-4139-b2f7-c9255b8ccb64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_0b84d7d3-77b6-4915-8219-b8b979f98c8c" 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_0df113ce-ec36-4139-b2f7-c9255b8ccb64" xlink:to="loc_us-gaap_RestrictedStockMember_0b84d7d3-77b6-4915-8219-b8b979f98c8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CanadianPlanMember_bc9bd4d8-650d-45dd-81c7-1c6ef56f71aa" xlink:href="whg-20220630.xsd#whg_CanadianPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0df113ce-ec36-4139-b2f7-c9255b8ccb64" xlink:to="loc_whg_CanadianPlanMember_bc9bd4d8-650d-45dd-81c7-1c6ef56f71aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_MutualFundShareIncentiveAwardsMember_81795c3c-4bb3-4f52-aca9-02a30b8e1ba6" xlink:href="whg-20220630.xsd#whg_MutualFundShareIncentiveAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0df113ce-ec36-4139-b2f7-c9255b8ccb64" xlink:to="loc_whg_MutualFundShareIncentiveAwardsMember_81795c3c-4bb3-4f52-aca9-02a30b8e1ba6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a8df22fa-3fd7-4605-b35e-3cb493b47249" 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_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_dei_LegalEntityAxis_a8df22fa-3fd7-4605-b35e-3cb493b47249" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a8df22fa-3fd7-4605-b35e-3cb493b47249_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_a8df22fa-3fd7-4605-b35e-3cb493b47249" xlink:to="loc_dei_EntityDomain_a8df22fa-3fd7-4605-b35e-3cb493b47249_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cfe8bb49-6c22-47d5-8184-70a86ad634ea" 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_a8df22fa-3fd7-4605-b35e-3cb493b47249" xlink:to="loc_dei_EntityDomain_cfe8bb49-6c22-47d5-8184-70a86ad634ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_WestwoodInternationalAdvisorsIncMember_746ce1b1-e0a9-442a-b34d-6985f350b598" xlink:href="whg-20220630.xsd#whg_WestwoodInternationalAdvisorsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cfe8bb49-6c22-47d5-8184-70a86ad634ea" xlink:to="loc_whg_WestwoodInternationalAdvisorsIncMember_746ce1b1-e0a9-442a-b34d-6985f350b598" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a5455473-9e7b-403b-b3fa-f81463f046ee" 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_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a5455473-9e7b-403b-b3fa-f81463f046ee" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_a5455473-9e7b-403b-b3fa-f81463f046ee_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_a5455473-9e7b-403b-b3fa-f81463f046ee" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_a5455473-9e7b-403b-b3fa-f81463f046ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_ee2cc92a-89b2-4aa7-8036-8ffd25b2ac7e" 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_a5455473-9e7b-403b-b3fa-f81463f046ee" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_ee2cc92a-89b2-4aa7-8036-8ffd25b2ac7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_d8062c49-8f3d-4a30-bc67-548184ba077f" 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_ee2cc92a-89b2-4aa7-8036-8ffd25b2ac7e" xlink:to="loc_us-gaap_MutualFundMember_d8062c49-8f3d-4a30-bc67-548184ba077f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_de35bcab-16b5-480d-8825-b1d438f551fe" 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_ba246795-8f18-4e18-b414-8676c0d7d17a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_de35bcab-16b5-480d-8825-b1d438f551fe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_de35bcab-16b5-480d-8825-b1d438f551fe_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_de35bcab-16b5-480d-8825-b1d438f551fe" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_de35bcab-16b5-480d-8825-b1d438f551fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1efa0b6b-6291-4e71-8318-1dcd7774cd48" 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_de35bcab-16b5-480d-8825-b1d438f551fe" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1efa0b6b-6291-4e71-8318-1dcd7774cd48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_4af8fdfc-666e-4643-a810-54dbe567da37" 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_1efa0b6b-6291-4e71-8318-1dcd7774cd48" xlink:to="loc_us-gaap_RestrictedStockMember_4af8fdfc-666e-4643-a810-54dbe567da37" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails" xlink:type="simple" xlink:href="whg-20220630.xsd#LONGTERMINCENTIVECOMPENSATIONDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails" xlink:type="extended" id="iecb7f4aa82354d83b5bd8201e6688926_LONGTERMINCENTIVECOMPENSATIONDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_024e87d5-2ac6-4a4b-9134-1cc3a68a77ec" 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_5386d60e-6c5c-4da1-a943-2efea5349231" 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_024e87d5-2ac6-4a4b-9134-1cc3a68a77ec" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_5386d60e-6c5c-4da1-a943-2efea5349231" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b3ed6436-e77d-4fbc-871f-78c369d72dda" 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_024e87d5-2ac6-4a4b-9134-1cc3a68a77ec" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b3ed6436-e77d-4fbc-871f-78c369d72dda" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_12b3f143-da99-4f27-8a01-d475fe0604bd" 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_b3ed6436-e77d-4fbc-871f-78c369d72dda" xlink:to="loc_us-gaap_AwardTypeAxis_12b3f143-da99-4f27-8a01-d475fe0604bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_12b3f143-da99-4f27-8a01-d475fe0604bd_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_12b3f143-da99-4f27-8a01-d475fe0604bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_12b3f143-da99-4f27-8a01-d475fe0604bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5e9529aa-e9e2-49d3-ba2a-659b575603e1" 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_12b3f143-da99-4f27-8a01-d475fe0604bd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5e9529aa-e9e2-49d3-ba2a-659b575603e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DomesticEmployeeServiceAwardMember_b4ce16bb-ff51-4cca-972e-842b64056da9" xlink:href="whg-20220630.xsd#whg_DomesticEmployeeServiceAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5e9529aa-e9e2-49d3-ba2a-659b575603e1" xlink:to="loc_whg_DomesticEmployeeServiceAwardMember_b4ce16bb-ff51-4cca-972e-842b64056da9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_ba66454d-1ca7-4fc8-9521-6ed11f802837" 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_5e9529aa-e9e2-49d3-ba2a-659b575603e1" xlink:to="loc_us-gaap_PerformanceSharesMember_ba66454d-1ca7-4fc8-9521-6ed11f802837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_DomesticServiceAndPerformanceAwardMember_b2628176-2843-4b97-a1f6-a28b5a7db355" xlink:href="whg-20220630.xsd#whg_DomesticServiceAndPerformanceAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5e9529aa-e9e2-49d3-ba2a-659b575603e1" xlink:to="loc_whg_DomesticServiceAndPerformanceAwardMember_b2628176-2843-4b97-a1f6-a28b5a7db355" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_CanadianEmployeeServiceAwardMember_becf22e0-e813-4530-beaf-585b225c4702" xlink:href="whg-20220630.xsd#whg_CanadianEmployeeServiceAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5e9529aa-e9e2-49d3-ba2a-659b575603e1" xlink:to="loc_whg_CanadianEmployeeServiceAwardMember_becf22e0-e813-4530-beaf-585b225c4702" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_d5851bfa-5a70-4509-8684-cb61f67a8abe" 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_5e9529aa-e9e2-49d3-ba2a-659b575603e1" xlink:to="loc_us-gaap_RestrictedStockMember_d5851bfa-5a70-4509-8684-cb61f67a8abe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_0441853f-e550-4d74-8bc8-9356c06f8d62" 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_b3ed6436-e77d-4fbc-871f-78c369d72dda" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_0441853f-e550-4d74-8bc8-9356c06f8d62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_0441853f-e550-4d74-8bc8-9356c06f8d62_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_0441853f-e550-4d74-8bc8-9356c06f8d62" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_0441853f-e550-4d74-8bc8-9356c06f8d62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_aa86cc13-80f6-45f7-9407-89e86f8fc2b6" 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_0441853f-e550-4d74-8bc8-9356c06f8d62" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_aa86cc13-80f6-45f7-9407-89e86f8fc2b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e5190ac5-5818-406d-903b-5ab0c8451c7c" 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_b3ed6436-e77d-4fbc-871f-78c369d72dda" xlink:to="loc_us-gaap_PlanNameAxis_e5190ac5-5818-406d-903b-5ab0c8451c7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e5190ac5-5818-406d-903b-5ab0c8451c7c_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_e5190ac5-5818-406d-903b-5ab0c8451c7c" xlink:to="loc_us-gaap_PlanNameDomain_e5190ac5-5818-406d-903b-5ab0c8451c7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_ff722ca8-f8a2-49fc-8bf2-445e01c27478" 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_e5190ac5-5818-406d-903b-5ab0c8451c7c" xlink:to="loc_us-gaap_PlanNameDomain_ff722ca8-f8a2-49fc-8bf2-445e01c27478" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails1" xlink:type="simple" xlink:href="whg-20220630.xsd#LONGTERMINCENTIVECOMPENSATIONDetails1"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails1" xlink:type="extended" id="idf4a3c3a62974bdaa2c55f69abca0888_LONGTERMINCENTIVECOMPENSATIONDetails1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_cddb40f9-19e4-4587-b234-36869996716c" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" 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_cddb40f9-19e4-4587-b234-36869996716c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_711d118d-822d-4d9c-bd03-35035647273b" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_711d118d-822d-4d9c-bd03-35035647273b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5b3bcf7a-3631-4cd0-b008-b455b8517f9a" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5b3bcf7a-3631-4cd0-b008-b455b8517f9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_ea188664-7eda-4ce7-8cc7-e272e3d661a2" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_ea188664-7eda-4ce7-8cc7-e272e3d661a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_377f767a-3c08-459e-8402-feb506dffcc5" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_377f767a-3c08-459e-8402-feb506dffcc5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8197c86f-4422-493d-a920-5a71dc1d291a" 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_c270bc49-8df0-4b23-a63d-4b17b7e2513e" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c270bc49-8df0-4b23-a63d-4b17b7e2513e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b22a5177-078f-4243-8073-8895f5fb2387" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b22a5177-078f-4243-8073-8895f5fb2387" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_4e3387a1-cbdb-43f6-b593-c912ceb04f6e" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_4e3387a1-cbdb-43f6-b593-c912ceb04f6e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_5cf5cc75-c7a7-452d-ab36-595a1545ae1a" 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_4ba731f6-7aa4-4289-b6d8-50a5eb8fde6b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_5cf5cc75-c7a7-452d-ab36-595a1545ae1a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bf839754-6644-4571-a1bc-842f2d39959b" 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_28b9cf1e-783b-4401-be98-aef77f4f6822" 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_cddb40f9-19e4-4587-b234-36869996716c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_28b9cf1e-783b-4401-be98-aef77f4f6822" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_4dd93957-9dfe-499f-a26d-0d4d2d11531a" 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_28b9cf1e-783b-4401-be98-aef77f4f6822" xlink:to="loc_us-gaap_AwardTypeAxis_4dd93957-9dfe-499f-a26d-0d4d2d11531a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4dd93957-9dfe-499f-a26d-0d4d2d11531a_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_4dd93957-9dfe-499f-a26d-0d4d2d11531a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4dd93957-9dfe-499f-a26d-0d4d2d11531a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0583b86f-2dfe-4bfd-84dd-3e4e18c6ea95" 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_4dd93957-9dfe-499f-a26d-0d4d2d11531a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0583b86f-2dfe-4bfd-84dd-3e4e18c6ea95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_bc44779c-0bdd-4c95-abbf-c7afc108ff9f" 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_0583b86f-2dfe-4bfd-84dd-3e4e18c6ea95" xlink:to="loc_us-gaap_RestrictedStockMember_bc44779c-0bdd-4c95-abbf-c7afc108ff9f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails2" xlink:type="simple" xlink:href="whg-20220630.xsd#LONGTERMINCENTIVECOMPENSATIONDetails2"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LONGTERMINCENTIVECOMPENSATIONDetails2" xlink:type="extended" id="i8a0d9a2c4fa74521b4bccc6e48874f0c_LONGTERMINCENTIVECOMPENSATIONDetails2">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f232530b-4553-4e1d-ae21-5928e48023d7" 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_981661f7-0719-4018-b3c6-838f2589ffba" 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_f232530b-4553-4e1d-ae21-5928e48023d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_981661f7-0719-4018-b3c6-838f2589ffba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_20a0eefb-35e1-4fae-a9da-dfe316d06e37" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_20a0eefb-35e1-4fae-a9da-dfe316d06e37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6b6d83c6-32b4-467b-8aca-98c4d64ada64" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6b6d83c6-32b4-467b-8aca-98c4d64ada64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_51761ec9-9605-40f6-b54e-0f43565fb97b" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_51761ec9-9605-40f6-b54e-0f43565fb97b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_55e33973-5209-40c2-aaaf-2746e50b1e45" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_55e33973-5209-40c2-aaaf-2746e50b1e45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1b62d565-c338-4a4b-a502-dcf785d2f5ca" 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_430e8e9b-127b-46d7-b59c-41f9dc4a712b" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_430e8e9b-127b-46d7-b59c-41f9dc4a712b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_42b17433-34cd-47aa-a8ed-72e01aab66a7" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_42b17433-34cd-47aa-a8ed-72e01aab66a7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6a3f7c7a-1683-4088-bbb6-5675dcdca76a" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6a3f7c7a-1683-4088-bbb6-5675dcdca76a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_370357ec-8a13-4290-9fb1-56179e242283" 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_981661f7-0719-4018-b3c6-838f2589ffba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_370357ec-8a13-4290-9fb1-56179e242283" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1d726d7e-4341-4e6c-afe3-5394406bd9e9" 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_1a1606a2-5f86-4bbb-8dd8-19dbfbac16e3" 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_f232530b-4553-4e1d-ae21-5928e48023d7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1a1606a2-5f86-4bbb-8dd8-19dbfbac16e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_529bc689-6fe8-4057-b9e3-be8a4cc736be" 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_1a1606a2-5f86-4bbb-8dd8-19dbfbac16e3" xlink:to="loc_us-gaap_AwardTypeAxis_529bc689-6fe8-4057-b9e3-be8a4cc736be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_529bc689-6fe8-4057-b9e3-be8a4cc736be_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_529bc689-6fe8-4057-b9e3-be8a4cc736be" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_529bc689-6fe8-4057-b9e3-be8a4cc736be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a76f84b-d7db-4647-aecd-d5b2d9c6669b" 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_529bc689-6fe8-4057-b9e3-be8a4cc736be" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a76f84b-d7db-4647-aecd-d5b2d9c6669b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_f6950b03-bf50-41e0-b11d-4dedb39ecd57" xlink:href="whg-20220630.xsd#whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a76f84b-d7db-4647-aecd-d5b2d9c6669b" xlink:to="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_f6950b03-bf50-41e0-b11d-4dedb39ecd57" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/RELATEDPARTYTRANSACTIONSDetailsTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#RELATEDPARTYTRANSACTIONSDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RELATEDPARTYTRANSACTIONSDetailsTextual" xlink:type="extended" id="i28b11c46cc704ce2b37bae8c5796c81c_RELATEDPARTYTRANSACTIONSDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_fe9508c9-1b2a-4491-9b89-b4588df316b0" 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_f3c39280-f7cd-40c5-8aaf-bf9ff8888018" 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_fe9508c9-1b2a-4491-9b89-b4588df316b0" xlink:to="loc_us-gaap_DueFromRelatedParties_f3c39280-f7cd-40c5-8aaf-bf9ff8888018" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromRelatedParties_7c2c4249-3dc3-42e5-b330-36063ee70e5d" 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_fe9508c9-1b2a-4491-9b89-b4588df316b0" xlink:to="loc_us-gaap_RevenueFromRelatedParties_7c2c4249-3dc3-42e5-b330-36063ee70e5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_80ae88e0-0e91-4a34-b287-a2c625085e76" 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_fe9508c9-1b2a-4491-9b89-b4588df316b0" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_80ae88e0-0e91-4a34-b287-a2c625085e76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_df103c51-e8ba-462a-bdd1-84004ef3da0c" 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_fe9508c9-1b2a-4491-9b89-b4588df316b0" xlink:to="loc_us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty_df103c51-e8ba-462a-bdd1-84004ef3da0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_6bc6abb7-9e9d-47e2-a07b-1e2d62e4acb6" 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_fe9508c9-1b2a-4491-9b89-b4588df316b0" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_6bc6abb7-9e9d-47e2-a07b-1e2d62e4acb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e9f0f189-89f9-4ce5-b3b0-3a56e9ba0a91" 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_6bc6abb7-9e9d-47e2-a07b-1e2d62e4acb6" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e9f0f189-89f9-4ce5-b3b0-3a56e9ba0a91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_e9f0f189-89f9-4ce5-b3b0-3a56e9ba0a91_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_e9f0f189-89f9-4ce5-b3b0-3a56e9ba0a91" xlink:to="loc_us-gaap_RelatedPartyDomain_e9f0f189-89f9-4ce5-b3b0-3a56e9ba0a91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_9c15b060-f87c-491d-90a1-a06bc99d817a" 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_e9f0f189-89f9-4ce5-b3b0-3a56e9ba0a91" xlink:to="loc_us-gaap_RelatedPartyDomain_9c15b060-f87c-491d-90a1-a06bc99d817a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrustForBenefitOfEmployeesMember_1bb89753-94db-474a-9c15-599aaba119b2" 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_9c15b060-f87c-491d-90a1-a06bc99d817a" xlink:to="loc_us-gaap_TrustForBenefitOfEmployeesMember_1bb89753-94db-474a-9c15-599aaba119b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_8a1c5993-32e3-45e5-b970-f5025b19576b" 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_6bc6abb7-9e9d-47e2-a07b-1e2d62e4acb6" xlink:to="loc_srt_ConsolidatedEntitiesAxis_8a1c5993-32e3-45e5-b970-f5025b19576b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_8a1c5993-32e3-45e5-b970-f5025b19576b_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_8a1c5993-32e3-45e5-b970-f5025b19576b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_8a1c5993-32e3-45e5-b970-f5025b19576b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_4ffc5dee-064f-433c-8016-ca2224a36513" 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_8a1c5993-32e3-45e5-b970-f5025b19576b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_4ffc5dee-064f-433c-8016-ca2224a36513" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_d11cbf3c-f203-459b-be22-700c48fa05e9" xlink:href="whg-20220630.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_4ffc5dee-064f-433c-8016-ca2224a36513" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_d11cbf3c-f203-459b-be22-700c48fa05e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_PrivateEquityInvestmentsMember_a4796164-6a88-495d-9cc9-e3a73d909259" xlink:href="whg-20220630.xsd#whg_PrivateEquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_4ffc5dee-064f-433c-8016-ca2224a36513" xlink:to="loc_whg_PrivateEquityInvestmentsMember_a4796164-6a88-495d-9cc9-e3a73d909259" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/LEASESTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#LEASESTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LEASESTextual" xlink:type="extended" id="id5921ccd81064533ab49ffce218baa13_LEASESTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_52fa491f-4b00-4d50-b315-a2df5194ecda" 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_5a645afd-0eab-4ec3-a1de-78bab3ded609" 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_52fa491f-4b00-4d50-b315-a2df5194ecda" xlink:to="loc_us-gaap_SubleaseIncome_5a645afd-0eab-4ec3-a1de-78bab3ded609" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_8a6d4682-63c3-42af-8786-f7bdcde424e3" 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_52fa491f-4b00-4d50-b315-a2df5194ecda" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_8a6d4682-63c3-42af-8786-f7bdcde424e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_25ec7966-c22c-4865-9be3-839781a89486" 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_8a6d4682-63c3-42af-8786-f7bdcde424e3" xlink:to="loc_srt_CounterpartyNameAxis_25ec7966-c22c-4865-9be3-839781a89486" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_25ec7966-c22c-4865-9be3-839781a89486_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_25ec7966-c22c-4865-9be3-839781a89486" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_25ec7966-c22c-4865-9be3-839781a89486_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_fbd0dba4-08b8-4373-838b-e520a8193ba0" 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_25ec7966-c22c-4865-9be3-839781a89486" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_fbd0dba4-08b8-4373-838b-e520a8193ba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_576b62c4-318d-49eb-a02a-3631d9b2228a" 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_8a6d4682-63c3-42af-8786-f7bdcde424e3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_576b62c4-318d-49eb-a02a-3631d9b2228a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_576b62c4-318d-49eb-a02a-3631d9b2228a_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_576b62c4-318d-49eb-a02a-3631d9b2228a" xlink:to="loc_us-gaap_SegmentDomain_576b62c4-318d-49eb-a02a-3631d9b2228a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_78fe3245-3ede-4eba-8cac-a631b9666903" 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_576b62c4-318d-49eb-a02a-3631d9b2228a" xlink:to="loc_us-gaap_SegmentDomain_78fe3245-3ede-4eba-8cac-a631b9666903" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionAxis_5a1f077a-6113-4ea3-b469-c3f9cdbca4a3" 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_8a6d4682-63c3-42af-8786-f7bdcde424e3" xlink:to="loc_us-gaap_GeographicDistributionAxis_5a1f077a-6113-4ea3-b469-c3f9cdbca4a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_5a1f077a-6113-4ea3-b469-c3f9cdbca4a3_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_5a1f077a-6113-4ea3-b469-c3f9cdbca4a3" xlink:to="loc_us-gaap_GeographicDistributionDomain_5a1f077a-6113-4ea3-b469-c3f9cdbca4a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_ffbbaa52-56c7-49ca-a0a8-19c4b03cfad9" 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_5a1f077a-6113-4ea3-b469-c3f9cdbca4a3" xlink:to="loc_us-gaap_GeographicDistributionDomain_ffbbaa52-56c7-49ca-a0a8-19c4b03cfad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7ead295f-b15f-42af-b613-e6d7e040c8f3" 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_8a6d4682-63c3-42af-8786-f7bdcde424e3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7ead295f-b15f-42af-b613-e6d7e040c8f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7ead295f-b15f-42af-b613-e6d7e040c8f3_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_7ead295f-b15f-42af-b613-e6d7e040c8f3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7ead295f-b15f-42af-b613-e6d7e040c8f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_501f7022-bd2c-4851-ae90-67fbf5929031" 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_7ead295f-b15f-42af-b613-e6d7e040c8f3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_501f7022-bd2c-4851-ae90-67fbf5929031" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_32562bf1-85c9-4e7b-a077-3fee6a0f7da8" 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_8a6d4682-63c3-42af-8786-f7bdcde424e3" xlink:to="loc_us-gaap_LeaseContractualTermAxis_32562bf1-85c9-4e7b-a077-3fee6a0f7da8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_32562bf1-85c9-4e7b-a077-3fee6a0f7da8_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_32562bf1-85c9-4e7b-a077-3fee6a0f7da8" xlink:to="loc_us-gaap_LeaseContractualTermDomain_32562bf1-85c9-4e7b-a077-3fee6a0f7da8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_cc3f4054-4a51-4a4b-8f05-8306a74abf8e" 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_32562bf1-85c9-4e7b-a077-3fee6a0f7da8" xlink:to="loc_us-gaap_LeaseContractualTermDomain_cc3f4054-4a51-4a4b-8f05-8306a74abf8e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/SEGMENTREPORTINGDetails" xlink:type="simple" xlink:href="whg-20220630.xsd#SEGMENTREPORTINGDetails"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SEGMENTREPORTINGDetails" xlink:type="extended" id="icbb0e625596f40d09d4def9db4ba45e6_SEGMENTREPORTINGDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_96b44deb-b0be-4903-af27-1ec532983a23" 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_c5c4e7eb-f32c-4303-b87d-279508681a38" xlink:href="whg-20220630.xsd#whg_RevenueFromExternalSources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_whg_RevenueFromExternalSources_c5c4e7eb-f32c-4303-b87d-279508681a38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_NetIntersegmentRevenues_ac21ff83-1467-4318-9c74-51ead1853cd6" xlink:href="whg-20220630.xsd#whg_NetIntersegmentRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_whg_NetIntersegmentRevenues_ac21ff83-1467-4318-9c74-51ead1853cd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeNet_c65361b7-584d-4371-b7e3-d6fa15ab4ff5" 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_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_us-gaap_InvestmentIncomeNet_c65361b7-584d-4371-b7e3-d6fa15ab4ff5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_Otherrevenue_688af86d-678e-4c19-b536-cfe57034ba89" xlink:href="whg-20220630.xsd#whg_Otherrevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_whg_Otherrevenue_688af86d-678e-4c19-b536-cfe57034ba89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_9efcc27a-2079-484b-a933-c9eff73dd7cd" 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_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_us-gaap_Revenues_9efcc27a-2079-484b-a933-c9eff73dd7cd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_95f99e19-f9a4-4bc5-a0cb-86b1d4e81efc" 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_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_us-gaap_Assets_95f99e19-f9a4-4bc5-a0cb-86b1d4e81efc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_4d5d1a9a-2d3d-41cf-b5a8-9266cb50da6c" 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_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_us-gaap_Goodwill_4d5d1a9a-2d3d-41cf-b5a8-9266cb50da6c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_15015074-cf78-4d1f-bf63-a8cb0ecdb6c3" 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_96b44deb-b0be-4903-af27-1ec532983a23" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_15015074-cf78-4d1f-bf63-a8cb0ecdb6c3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e275fe3b-b04b-4c57-b8ff-4383b6342375" 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_15015074-cf78-4d1f-bf63-a8cb0ecdb6c3" xlink:to="loc_us-gaap_AwardTypeAxis_e275fe3b-b04b-4c57-b8ff-4383b6342375" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e275fe3b-b04b-4c57-b8ff-4383b6342375_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_e275fe3b-b04b-4c57-b8ff-4383b6342375" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e275fe3b-b04b-4c57-b8ff-4383b6342375_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2383648b-3cd8-4b81-b632-7d23e1481e23" 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_e275fe3b-b04b-4c57-b8ff-4383b6342375" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2383648b-3cd8-4b81-b632-7d23e1481e23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_396b9445-c6b2-4928-aeb8-6bcbbe8d315a" 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_2383648b-3cd8-4b81-b632-7d23e1481e23" xlink:to="loc_us-gaap_RestrictedStockMember_396b9445-c6b2-4928-aeb8-6bcbbe8d315a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_46188cc1-f7c5-42a2-9335-13282021be24" 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_15015074-cf78-4d1f-bf63-a8cb0ecdb6c3" xlink:to="loc_srt_ConsolidationItemsAxis_46188cc1-f7c5-42a2-9335-13282021be24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_46188cc1-f7c5-42a2-9335-13282021be24_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_46188cc1-f7c5-42a2-9335-13282021be24" xlink:to="loc_srt_ConsolidationItemsDomain_46188cc1-f7c5-42a2-9335-13282021be24_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_324c208c-17d5-4d44-b0ae-c6a0daac0229" 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_46188cc1-f7c5-42a2-9335-13282021be24" xlink:to="loc_srt_ConsolidationItemsDomain_324c208c-17d5-4d44-b0ae-c6a0daac0229" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_90b844f4-266b-4239-af74-6e0d50cac9a3" 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_324c208c-17d5-4d44-b0ae-c6a0daac0229" xlink:to="loc_us-gaap_OperatingSegmentsMember_90b844f4-266b-4239-af74-6e0d50cac9a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_e9692d3e-9270-4b99-9bff-c01eec87f5e8" 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_324c208c-17d5-4d44-b0ae-c6a0daac0229" xlink:to="loc_us-gaap_CorporateNonSegmentMember_e9692d3e-9270-4b99-9bff-c01eec87f5e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_2330e2e3-22e6-4e60-a158-19f6b40f7031" 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_324c208c-17d5-4d44-b0ae-c6a0daac0229" xlink:to="loc_us-gaap_IntersegmentEliminationMember_2330e2e3-22e6-4e60-a158-19f6b40f7031" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_e5e5e8f5-552b-41a6-96b0-cbe0f15180d3" 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_15015074-cf78-4d1f-bf63-a8cb0ecdb6c3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_e5e5e8f5-552b-41a6-96b0-cbe0f15180d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e5e5e8f5-552b-41a6-96b0-cbe0f15180d3_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_e5e5e8f5-552b-41a6-96b0-cbe0f15180d3" xlink:to="loc_us-gaap_SegmentDomain_e5e5e8f5-552b-41a6-96b0-cbe0f15180d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_883e61ce-9d93-40dc-9293-8bf7a7a773d4" 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_e5e5e8f5-552b-41a6-96b0-cbe0f15180d3" xlink:to="loc_us-gaap_SegmentDomain_883e61ce-9d93-40dc-9293-8bf7a7a773d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_AdvisoryMember_62c1281f-5ff3-4132-be15-6d2589e7e5b4" xlink:href="whg-20220630.xsd#whg_AdvisoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_883e61ce-9d93-40dc-9293-8bf7a7a773d4" xlink:to="loc_whg_AdvisoryMember_62c1281f-5ff3-4132-be15-6d2589e7e5b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustMember_81a7e9b1-0360-4265-9c17-a72a66ff96aa" xlink:href="whg-20220630.xsd#whg_TrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_883e61ce-9d93-40dc-9293-8bf7a7a773d4" xlink:to="loc_whg_TrustMember_81a7e9b1-0360-4265-9c17-a72a66ff96aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_120b791a-4de3-4302-b7ab-cf2cc2198d08" 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_883e61ce-9d93-40dc-9293-8bf7a7a773d4" xlink:to="loc_us-gaap_CorporateNonSegmentMember_120b791a-4de3-4302-b7ab-cf2cc2198d08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_8330e0e6-5dd7-448b-864e-b771d0e66d7c" 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_883e61ce-9d93-40dc-9293-8bf7a7a773d4" xlink:to="loc_us-gaap_IntersegmentEliminationMember_8330e0e6-5dd7-448b-864e-b771d0e66d7c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/SUBSEQUENTEVENTS" xlink:type="simple" xlink:href="whg-20220630.xsd#SUBSEQUENTEVENTS"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SUBSEQUENTEVENTS" xlink:type="extended" id="i3ecc957485cb4c1dae9521c66ef23b98_SUBSEQUENTEVENTS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_dee88c42-a1ca-48e5-bb3f-65f8a0583db8" 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_44941e56-b08f-4d8b-8026-4b3d5856d83b" 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_dee88c42-a1ca-48e5-bb3f-65f8a0583db8" xlink:to="loc_us-gaap_SubsequentEventTable_44941e56-b08f-4d8b-8026-4b3d5856d83b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_ccb06501-14ec-4bb8-8ebd-d1509b7cf92e" 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_44941e56-b08f-4d8b-8026-4b3d5856d83b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_ccb06501-14ec-4bb8-8ebd-d1509b7cf92e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_ccb06501-14ec-4bb8-8ebd-d1509b7cf92e_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_ccb06501-14ec-4bb8-8ebd-d1509b7cf92e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_ccb06501-14ec-4bb8-8ebd-d1509b7cf92e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_e6b2c0d0-1f9e-4d7f-bd9f-5cbe4983a67a" 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_ccb06501-14ec-4bb8-8ebd-d1509b7cf92e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_e6b2c0d0-1f9e-4d7f-bd9f-5cbe4983a67a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_ee14570d-22ac-42ab-9f4f-ce7ec1e2e6ee" 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_e6b2c0d0-1f9e-4d7f-bd9f-5cbe4983a67a" xlink:to="loc_us-gaap_SubsequentEventMember_ee14570d-22ac-42ab-9f4f-ce7ec1e2e6ee" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://westwoodgroup.com/role/SUBSEQUENTEVENTSDetailsTextual" xlink:type="simple" xlink:href="whg-20220630.xsd#SUBSEQUENTEVENTSDetailsTextual"/>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SUBSEQUENTEVENTSDetailsTextual" xlink:type="extended" id="if847ab96bbc94f908efc75ff17fe6d4b_SUBSEQUENTEVENTSDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" 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_87e82d02-4a52-4bb0-96f9-c90447d5ea00" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_87e82d02-4a52-4bb0-96f9-c90447d5ea00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_dd8c7f1d-5f33-4ba3-a89b-886a19f9bbbe" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_dd8c7f1d-5f33-4ba3-a89b-886a19f9bbbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_b18d3bc7-6da4-42c4-91cc-3a67240e8c55" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_b18d3bc7-6da4-42c4-91cc-3a67240e8c55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_f068d3f6-7534-44c2-8615-9c859969437c" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_f068d3f6-7534-44c2-8615-9c859969437c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_66d3c4e4-2a06-48a1-af08-9dc9693364d8" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_66d3c4e4-2a06-48a1-af08-9dc9693364d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_be72bfff-2cb4-44fd-8a63-83c215e30146" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_be72bfff-2cb4-44fd-8a63-83c215e30146" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_739567a0-6475-424e-9e97-8bd3826645c4" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_739567a0-6475-424e-9e97-8bd3826645c4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_StockRepurchaseProgram_3aae60cf-6d3c-46fd-a846-7bba26368721" xlink:href="whg-20220630.xsd#whg_StockRepurchaseProgram"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_whg_StockRepurchaseProgram_3aae60cf-6d3c-46fd-a846-7bba26368721" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_StockRepurchaseAuthorizationSubsequentEvent_932b0dde-5c7e-4198-893b-e2d6b522f5d9" xlink:href="whg-20220630.xsd#whg_StockRepurchaseAuthorizationSubsequentEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_whg_StockRepurchaseAuthorizationSubsequentEvent_932b0dde-5c7e-4198-893b-e2d6b522f5d9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventDescription_7e82a709-668c-4825-9e2b-ef70f7776374" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_SubsequentEventDescription_7e82a709-668c-4825-9e2b-ef70f7776374" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_daa90c9f-2b13-4a90-913f-e5d7520b8cf7" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_daa90c9f-2b13-4a90-913f-e5d7520b8cf7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_f4a5c569-0696-4b19-9c90-2398eb43f8b4" 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_4f9276e7-b8f7-4371-b96d-eb6ab59425bb" xlink:to="loc_us-gaap_SubsequentEventTable_f4a5c569-0696-4b19-9c90-2398eb43f8b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_feaa0f76-cc9e-434c-8c07-2172b0b21f4f" 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_f4a5c569-0696-4b19-9c90-2398eb43f8b4" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_feaa0f76-cc9e-434c-8c07-2172b0b21f4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_feaa0f76-cc9e-434c-8c07-2172b0b21f4f_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_feaa0f76-cc9e-434c-8c07-2172b0b21f4f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_feaa0f76-cc9e-434c-8c07-2172b0b21f4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a6ae1a39-c6d1-4a78-aa4e-69a616f4ba8a" 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_feaa0f76-cc9e-434c-8c07-2172b0b21f4f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a6ae1a39-c6d1-4a78-aa4e-69a616f4ba8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_b2b99f44-477e-4e46-980e-f9bb46ac9bff" 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_a6ae1a39-c6d1-4a78-aa4e-69a616f4ba8a" xlink:to="loc_us-gaap_SubsequentEventMember_b2b99f44-477e-4e46-980e-f9bb46ac9bff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e154ef7d-e598-4dc8-a94b-bb80bd79f621" 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_f4a5c569-0696-4b19-9c90-2398eb43f8b4" xlink:to="loc_srt_ProductOrServiceAxis_e154ef7d-e598-4dc8-a94b-bb80bd79f621" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e154ef7d-e598-4dc8-a94b-bb80bd79f621_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_e154ef7d-e598-4dc8-a94b-bb80bd79f621" xlink:to="loc_srt_ProductsAndServicesDomain_e154ef7d-e598-4dc8-a94b-bb80bd79f621_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9fb44378-f444-4464-ac93-957b4af22550" 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_e154ef7d-e598-4dc8-a94b-bb80bd79f621" xlink:to="loc_srt_ProductsAndServicesDomain_9fb44378-f444-4464-ac93-957b4af22550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_whg_TrustPerformanceBasedFeesMember_189eedc9-a345-4d59-92ed-da534dda6e7c" xlink:href="whg-20220630.xsd#whg_TrustPerformanceBasedFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9fb44378-f444-4464-ac93-957b4af22550" xlink:to="loc_whg_TrustPerformanceBasedFeesMember_189eedc9-a345-4d59-92ed-da534dda6e7c" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
