

<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://westwoodgroup.com/role/ComponentsOfOciDetails" xlink:href="whg-20190630.xsd#ComponentsOfOciDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/CondensedConsolidatedBalanceSheets" xlink:href="whg-20190630.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="whg-20190630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/CondensedConsolidatedStatementOfStockholdersEquity" xlink:href="whg-20190630.xsd#CondensedConsolidatedStatementOfStockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="whg-20190630.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:href="whg-20190630.xsd#CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/DescriptionOfBusiness" xlink:href="whg-20190630.xsd#DescriptionOfBusiness" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/DescriptionOfBusinessOmahaOperationsDivestitureDetails" xlink:href="whg-20190630.xsd#DescriptionOfBusinessOmahaOperationsDivestitureDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/DescriptionOfBusinessTableTables" xlink:href="whg-20190630.xsd#DescriptionOfBusinessTableTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/DocumentAndEntityInformation" xlink:href="whg-20190630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/EarningsPerShare" xlink:href="whg-20190630.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/EarningsPerShareDetails" xlink:href="whg-20190630.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/EarningsPerShareDetailsTextual" xlink:href="whg-20190630.xsd#EarningsPerShareDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/EarningsPerSharePoliciesPolicies" xlink:href="whg-20190630.xsd#EarningsPerSharePoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/EarningsPerShareTables" xlink:href="whg-20190630.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/FairValueMeasurements" xlink:href="whg-20190630.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/FairValueMeasurementsDetails" xlink:href="whg-20190630.xsd#FairValueMeasurementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/FairValueMeasurementsTables" xlink:href="whg-20190630.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/GoodwillAndOtherIntangibleAssets" xlink:href="whg-20190630.xsd#GoodwillAndOtherIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/GoodwillAndOtherIntangibleAssetsDetailsTextual" xlink:href="whg-20190630.xsd#GoodwillAndOtherIntangibleAssetsDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/GoodwillAndOtherIntangibleAssetsTableTables" xlink:href="whg-20190630.xsd#GoodwillAndOtherIntangibleAssetsTableTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/IncomeTaxesEffectiveTaxRateDetails" xlink:href="whg-20190630.xsd#IncomeTaxesEffectiveTaxRateDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/IncomeTaxesNotes" xlink:href="whg-20190630.xsd#IncomeTaxesNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/IncomeTaxesTables" xlink:href="whg-20190630.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/Investments" xlink:href="whg-20190630.xsd#Investments" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/InvestmentsDetails" xlink:href="whg-20190630.xsd#InvestmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/InvestmentsDetailsTextual" xlink:href="whg-20190630.xsd#InvestmentsDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/InvestmentsTables" xlink:href="whg-20190630.xsd#InvestmentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LeasesDetails" xlink:href="whg-20190630.xsd#LeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LeasesNotes" xlink:href="whg-20190630.xsd#LeasesNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LeasesPolicies" xlink:href="whg-20190630.xsd#LeasesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LeasesTables" xlink:href="whg-20190630.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LongTermIncentiveCompensation" xlink:href="whg-20190630.xsd#LongTermIncentiveCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetails" xlink:href="whg-20190630.xsd#LongTermIncentiveCompensationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetails1" xlink:href="whg-20190630.xsd#LongTermIncentiveCompensationDetails1" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetails2" xlink:href="whg-20190630.xsd#LongTermIncentiveCompensationDetails2" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetailsTextual" xlink:href="whg-20190630.xsd#LongTermIncentiveCompensationDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/LongTermIncentiveCompensationTables" xlink:href="whg-20190630.xsd#LongTermIncentiveCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/RelatedPartyTransactions" xlink:href="whg-20190630.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/RelatedPartyTransactionsDetailsTextual" xlink:href="whg-20190630.xsd#RelatedPartyTransactionsDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/RevenueDisaggregationOfRevenueDetails" xlink:href="whg-20190630.xsd#RevenueDisaggregationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/RevenueNotes" xlink:href="whg-20190630.xsd#RevenueNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/RevenuePoliciesPolicies" xlink:href="whg-20190630.xsd#RevenuePoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/RevenueTableTables" xlink:href="whg-20190630.xsd#RevenueTableTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SegmentReporting" xlink:href="whg-20190630.xsd#SegmentReporting" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SegmentReportingDetails" xlink:href="whg-20190630.xsd#SegmentReportingDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SegmentReportingDetailsTextual" xlink:href="whg-20190630.xsd#SegmentReportingDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SegmentReportingTables" xlink:href="whg-20190630.xsd#SegmentReportingTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/StockholdersEquity" xlink:href="whg-20190630.xsd#StockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/StockholdersEquityTables" xlink:href="whg-20190630.xsd#StockholdersEquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SubsequentEvents" xlink:href="whg-20190630.xsd#SubsequentEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SubsequentEventsDetailsTextual" xlink:href="whg-20190630.xsd#SubsequentEventsDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="whg-20190630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesAccountingChangesAndErrorCorrectionsDetails" xlink:href="whg-20190630.xsd#SummaryOfSignificantAccountingPoliciesAccountingChangesAndErrorCorrectionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsTables" xlink:href="whg-20190630.xsd#SummaryOfSignificantAccountingPoliciesAccountingPronouncementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="whg-20190630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesDetails" xlink:href="whg-20190630.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/TemplateLink" xlink:href="whg-20190630.xsd#TemplateLink" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/VariableInterestEntities" xlink:href="whg-20190630.xsd#VariableInterestEntities" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/VariableInterestEntitiesDetails" xlink:href="whg-20190630.xsd#VariableInterestEntitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/VariableInterestEntitiesDetailsTextual" xlink:href="whg-20190630.xsd#VariableInterestEntitiesDetailsTextual" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/VariableInterestEntitiesPoliciesPolicies" xlink:href="whg-20190630.xsd#VariableInterestEntitiesPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://westwoodgroup.com/role/VariableInterestEntitiesTables" xlink:href="whg-20190630.xsd#VariableInterestEntitiesTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/ComponentsOfOciDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CondensedConsolidatedStatementOfStockholdersEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_7EDFC1F2439E8E08C1A94861BD221623" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_StatementTable_7EDFC1F2439E8E08C1A94861BD221623" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6B988DA22CF90A2F19364861BD23F7F5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_7EDFC1F2439E8E08C1A94861BD221623" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6B988DA22CF90A2F19364861BD23F7F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6B988DA22CF90A2F19364861BD23F7F5" xlink:to="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6B988DA22CF90A2F19364861BD23F7F5" xlink:to="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_B06008923FFBA43EB3BD4861BD2358EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:to="loc_us-gaap_CommonStockMember_B06008923FFBA43EB3BD4861BD2358EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_91CCEFFDB7E2AA0FE7FE4861BD24A977" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_91CCEFFDB7E2AA0FE7FE4861BD24A977" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_905941BD1CD43B931C724861BD24ADDD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:to="loc_us-gaap_TreasuryStockMember_905941BD1CD43B931C724861BD24ADDD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_E945F4167D59AC2E46DB4861BD24836C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_E945F4167D59AC2E46DB4861BD24836C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_955355D667F05BCFE3234861BD240EC7" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_E97C1211B4F47310D3C34861BD23BB18" xlink:to="loc_us-gaap_RetainedEarningsMember_955355D667F05BCFE3234861BD240EC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_54D35B50B305E972AD0B4861BD2444AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_54D35B50B305E972AD0B4861BD2444AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_09F68A45E2745F1CB05B4861BD252DC3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_StockholdersEquity_09F68A45E2745F1CB05B4861BD252DC3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_C051CF4EC95247B2A1314861BD25A6DC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_C051CF4EC95247B2A1314861BD25A6DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification" xlink:label="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification_52111366AD48AC8071004861BD25A741" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification_52111366AD48AC8071004861BD25A741" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_A8E6171F728013FD49BA4861BD2559D6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_NetIncomeLoss_A8E6171F728013FD49BA4861BD2559D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_0D40D5C9CEA5F3023E4C4861BD256451" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_0D40D5C9CEA5F3023E4C4861BD256451" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_5A769B0DB289EF5BD3604861BD25D8D0" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_5A769B0DB289EF5BD3604861BD25D8D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_E5FFEE377226F39F87764861BD2628B9" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_E5FFEE377226F39F87764861BD2628B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_542457FF7B251842B09B4861BD26106D" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_542457FF7B251842B09B4861BD26106D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DividendsCommonStock" xlink:label="loc_us-gaap_DividendsCommonStock_54D74E735E46B3B2FB354861BD26669F" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_DividendsCommonStock_54D74E735E46B3B2FB354861BD26669F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_3CD2FA11DB36050A93A14861BD26004C" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_3CD2FA11DB36050A93A14861BD26004C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_C942495C2BEC313AE8AA4861BD26032A" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_C942495C2BEC313AE8AA4861BD26032A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_B91936A44B82CD5E2B884861BD276763" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_B91936A44B82CD5E2B884861BD276763" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TreasurySharesValueAcquiredforBenefitPlan" xlink:label="loc_whg_TreasurySharesValueAcquiredforBenefitPlan_DCE67515CE6708D704A14861BD276E85" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_whg_TreasurySharesValueAcquiredforBenefitPlan_DCE67515CE6708D704A14861BD276E85" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TreasurySharesAcquiredforBenefitPlan" xlink:label="loc_whg_TreasurySharesAcquiredforBenefitPlan_508536E2FEC5F321E7924861BD27F1EA" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_whg_TreasurySharesAcquiredforBenefitPlan_508536E2FEC5F321E7924861BD27F1EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_0FBA419484CD9BDC30214861BD27C605" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_0FBA419484CD9BDC30214861BD27C605" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings" xlink:label="loc_us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings_25156D140FC802BA00904861BD273E5F" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings_25156D140FC802BA00904861BD273E5F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings" xlink:label="loc_us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings_69ECCBD98F7B3F10D2D24861BD27FC66" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings_69ECCBD98F7B3F10D2D24861BD27FC66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_117842F80DE0569683FD4861BD283F19" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_117842F80DE0569683FD4861BD283F19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_BFCC0B63BF9F378BAED64861BD280415" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5286D1E483E57996FAB54861BD245D74" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_BFCC0B63BF9F378BAED64861BD280415" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_E91C87A34A6BE27755414861BD369B65" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_FBC7817335EC868443A64861BD358F9E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_E91C87A34A6BE27755414861BD369B65" xlink:to="loc_us-gaap_StatementTable_FBC7817335EC868443A64861BD358F9E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_5940DDD4BBD966226A664861BD35CBAA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_FBC7817335EC868443A64861BD358F9E" xlink:to="loc_srt_ProductOrServiceAxis_5940DDD4BBD966226A664861BD35CBAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_5940DDD4BBD966226A664861BD35CBAA" xlink:to="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_5940DDD4BBD966226A664861BD35CBAA" xlink:to="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetManagement1Member" xlink:label="loc_us-gaap_AssetManagement1Member_5A2868A37694D8AFD7804861BD369A9E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E" xlink:to="loc_us-gaap_AssetManagement1Member_5A2868A37694D8AFD7804861BD369A9E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentPerformanceMember" xlink:label="loc_us-gaap_InvestmentPerformanceMember_B78A56C715226455C38F4861BD369AB8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E" xlink:to="loc_us-gaap_InvestmentPerformanceMember_B78A56C715226455C38F4861BD369AB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiduciaryAndTrustMember" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_CE03A1DC78F48D56FF744861BD36B104" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_77A93BCB55F40FF5CE654861BD35975E" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_CE03A1DC78F48D56FF744861BD36B104" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_87DC1B3D1BD7A10EE5D94861BD3638F6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_FBC7817335EC868443A64861BD358F9E" xlink:to="loc_us-gaap_StatementScenarioAxis_87DC1B3D1BD7A10EE5D94861BD3638F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_77148CF79FBE09CA009F4861BD36EF0D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_87DC1B3D1BD7A10EE5D94861BD3638F6" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_77148CF79FBE09CA009F4861BD36EF0D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_77148CF79FBE09CA009F4861BD36EF0D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_87DC1B3D1BD7A10EE5D94861BD3638F6" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_77148CF79FBE09CA009F4861BD36EF0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_00C607CBE50AFF867D5A4861BD37E823" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_E91C87A34A6BE27755414861BD369B65" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_00C607CBE50AFF867D5A4861BD37E823" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/DescriptionOfBusiness" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/DescriptionOfBusinessOmahaOperationsDivestitureDetails" xlink:type="extended">
    <link:loc xlink:href="whg-20190630.xsd#whg_CashProceedsFromDivestitureLineItems" xlink:label="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:type="locator" />
    <link:loc xlink:href="whg-20190630.xsd#whg_CashProceedsFromDivestitureTable" xlink:label="loc_whg_CashProceedsFromDivestitureTable_1025BCDA77A91D5A3618299F3FA7ECFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_whg_CashProceedsFromDivestitureTable_1025BCDA77A91D5A3618299F3FA7ECFC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_0B5D4B3619AAA008B86E299F3FA7EB1E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_whg_CashProceedsFromDivestitureTable_1025BCDA77A91D5A3618299F3FA7ECFC" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_0B5D4B3619AAA008B86E299F3FA7EB1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_474226BE05B6A1B1A1D4299F3FA849D2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_0B5D4B3619AAA008B86E299F3FA7EB1E" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_474226BE05B6A1B1A1D4299F3FA849D2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_474226BE05B6A1B1A1D4299F3FA849D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_0B5D4B3619AAA008B86E299F3FA7EB1E" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_474226BE05B6A1B1A1D4299F3FA849D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_F066655110BEE20CE1DF299F3FA8F3EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_474226BE05B6A1B1A1D4299F3FA849D2" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_F066655110BEE20CE1DF299F3FA8F3EE" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PurchasePriceAllocationAxis" xlink:label="loc_whg_PurchasePriceAllocationAxis_DF3FF87D5ABCD487D40D299F3FA850DF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_whg_CashProceedsFromDivestitureTable_1025BCDA77A91D5A3618299F3FA7ECFC" xlink:to="loc_whg_PurchasePriceAllocationAxis_DF3FF87D5ABCD487D40D299F3FA850DF" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PurchasePriceAllocationDomain" xlink:label="loc_whg_PurchasePriceAllocationDomain_4C3782168FC693037453299F3FA82E2A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_whg_PurchasePriceAllocationAxis_DF3FF87D5ABCD487D40D299F3FA850DF" xlink:to="loc_whg_PurchasePriceAllocationDomain_4C3782168FC693037453299F3FA82E2A_default" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PurchasePriceAllocationDomain" xlink:label="loc_whg_PurchasePriceAllocationDomain_4C3782168FC693037453299F3FA82E2A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_whg_PurchasePriceAllocationAxis_DF3FF87D5ABCD487D40D299F3FA850DF" xlink:to="loc_whg_PurchasePriceAllocationDomain_4C3782168FC693037453299F3FA82E2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_F21A4EFAD4EA032CC005299F3FA84B53" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_whg_CashProceedsFromDivestitureTable_1025BCDA77A91D5A3618299F3FA7ECFC" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_F21A4EFAD4EA032CC005299F3FA84B53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_08D2DD7B3ABC00E9D669299F3FA9F229_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_F21A4EFAD4EA032CC005299F3FA84B53" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_08D2DD7B3ABC00E9D669299F3FA9F229_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_08D2DD7B3ABC00E9D669299F3FA9F229" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_F21A4EFAD4EA032CC005299F3FA84B53" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_08D2DD7B3ABC00E9D669299F3FA9F229" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_64F064C87467FDD37B30299F3FA9D27C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_64F064C87467FDD37B30299F3FA9D27C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_4F3AE9EDE6A8AE955BFE299F3FA9ADEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_4F3AE9EDE6A8AE955BFE299F3FA9ADEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_00D3935A56E3C0C7488C299F3FA958BC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_OtherAssetsCurrent_00D3935A56E3C0C7488C299F3FA958BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_FC64BE6C74B9997D9E13299F3FAA3BE4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_Goodwill_FC64BE6C74B9997D9E13299F3FAA3BE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_FEAFF5DDA4764E30C08F299F3FAA3CBE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_FEAFF5DDA4764E30C08F299F3FAA3CBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_DF1A43F347C5BFCBBE76299F3FAA333F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_DF1A43F347C5BFCBBE76299F3FAA333F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_BF0CB8F32E2A87074901299F3FAADFB1" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_BF0CB8F32E2A87074901299F3FAADFB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_F23C2B9BC61CCC3C0F2E299F3FAAC4EA" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_F23C2B9BC61CCC3C0F2E299F3FAAC4EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_7AD24CE3457719ED4379299F3FAAAE98" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_CashProceedsFromDivestitureLineItems_A5C4BDA981F7451B731A299F3FA97C74" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_7AD24CE3457719ED4379299F3FAAAE98" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/DescriptionOfBusinessTableTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EarningsPerShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EarningsPerShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EarningsPerShareDetailsTextual" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_36D20E9ADCCC719A9AA729C783F92CAD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_D4BD0FD59AEE30D6E5CB29C783F825FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_36D20E9ADCCC719A9AA729C783F92CAD" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_D4BD0FD59AEE30D6E5CB29C783F825FF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4CE9D199EA0F316E9D1229C783F83950" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_D4BD0FD59AEE30D6E5CB29C783F825FF" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4CE9D199EA0F316E9D1229C783F83950" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7C6D39974BFC1FAED31D29C783F92040_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4CE9D199EA0F316E9D1229C783F83950" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7C6D39974BFC1FAED31D29C783F92040_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7C6D39974BFC1FAED31D29C783F92040" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4CE9D199EA0F316E9D1229C783F83950" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7C6D39974BFC1FAED31D29C783F92040" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_0CD5CE6D978C7021987529C783F93142" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7C6D39974BFC1FAED31D29C783F92040" xlink:to="loc_us-gaap_RestrictedStockMember_0CD5CE6D978C7021987529C783F93142" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_C8C45BBE08DCB2A6E9E129C783F98C41" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_36D20E9ADCCC719A9AA729C783F92CAD" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_C8C45BBE08DCB2A6E9E129C783F98C41" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EarningsPerSharePoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8104A63CBAF48154900C7A352751D0AC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_715153817FF3F292F2C07A35274D43BB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8104A63CBAF48154900C7A352751D0AC" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_715153817FF3F292F2C07A35274D43BB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4F12C68E735B7EE10F4F7A35274EA3E7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_715153817FF3F292F2C07A35274D43BB" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4F12C68E735B7EE10F4F7A35274EA3E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4F12C68E735B7EE10F4F7A35274EA3E7" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4F12C68E735B7EE10F4F7A35274EA3E7" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_3B677582C3C907ABB4787A35274EC4C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_3B677582C3C907ABB4787A35274EC4C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_746A46B4FDACAF7D24A27A35274F933C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_746A46B4FDACAF7D24A27A35274F933C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_E29A5A62D65DC495DA807A35274F6802" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_223FFDA7638C81F46C1B7A35274E3DF5" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_E29A5A62D65DC495DA807A35274F6802" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_FairValueHierarchyIncludingNAVAxis" xlink:label="loc_whg_FairValueHierarchyIncludingNAVAxis_83FB339064DC030E8BD97A3527505D64" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_715153817FF3F292F2C07A35274D43BB" xlink:to="loc_whg_FairValueHierarchyIncludingNAVAxis_83FB339064DC030E8BD97A3527505D64" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_FairValueHierarchyIncludingNAVDomain" xlink:label="loc_whg_FairValueHierarchyIncludingNAVDomain_2A4816C2A2FF00C68E207A3527503BB6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_whg_FairValueHierarchyIncludingNAVAxis_83FB339064DC030E8BD97A3527505D64" xlink:to="loc_whg_FairValueHierarchyIncludingNAVDomain_2A4816C2A2FF00C68E207A3527503BB6_default" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_FairValueHierarchyIncludingNAVDomain" xlink:label="loc_whg_FairValueHierarchyIncludingNAVDomain_2A4816C2A2FF00C68E207A3527503BB6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_whg_FairValueHierarchyIncludingNAVAxis_83FB339064DC030E8BD97A3527505D64" xlink:to="loc_whg_FairValueHierarchyIncludingNAVDomain_2A4816C2A2FF00C68E207A3527503BB6" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_InputsNetAssetValueMember" xlink:label="loc_whg_InputsNetAssetValueMember_D85AFA5797BC48338FF97A352750FACB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_whg_FairValueHierarchyIncludingNAVDomain_2A4816C2A2FF00C68E207A3527503BB6" xlink:to="loc_whg_InputsNetAssetValueMember_D85AFA5797BC48338FF97A352750FACB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_17DE836A5A3752E3737D7A35275162E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_8104A63CBAF48154900C7A352751D0AC" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_17DE836A5A3752E3737D7A35275162E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecurities" xlink:label="loc_us-gaap_TradingSecurities_B5D0FDC43AA598BE898F7A3527514D71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_17DE836A5A3752E3737D7A35275162E3" xlink:to="loc_us-gaap_TradingSecurities_B5D0FDC43AA598BE898F7A3527514D71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_919A7DDD1FF1EB368DA07A3527526A7D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_17DE836A5A3752E3737D7A35275162E3" xlink:to="loc_us-gaap_ShortTermInvestments_919A7DDD1FF1EB368DA07A3527526A7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AlternativeInvestment" xlink:label="loc_us-gaap_AlternativeInvestment_9A774EA00711D37D6C0A7A35275204D2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_17DE836A5A3752E3737D7A35275162E3" xlink:to="loc_us-gaap_AlternativeInvestment_9A774EA00711D37D6C0A7A35275204D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueNetAssetLiability" xlink:label="loc_us-gaap_FairValueNetAssetLiability_E9A733F57E1AB322A1B77A352752CB77" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosureAbstract_17DE836A5A3752E3737D7A35275162E3" xlink:to="loc_us-gaap_FairValueNetAssetLiability_E9A733F57E1AB322A1B77A352752CB77" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/FairValueMeasurementsTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6CC61BA2507762AFBE497A3525AF6494" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9771121D050062E682507A3525AD29C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6CC61BA2507762AFBE497A3525AF6494" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9771121D050062E682507A3525AD29C3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8BFAB7E2ADAC5B256C687A3525AE05B6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9771121D050062E682507A3525AD29C3" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8BFAB7E2ADAC5B256C687A3525AE05B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_BFC4522E41FE60A0A6197A3525AEB8C0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8BFAB7E2ADAC5B256C687A3525AE05B6" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_BFC4522E41FE60A0A6197A3525AEB8C0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_BFC4522E41FE60A0A6197A3525AEB8C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_8BFAB7E2ADAC5B256C687A3525AE05B6" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_BFC4522E41FE60A0A6197A3525AEB8C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5ED314E5945CE0FD631D7A3525AE06CB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9771121D050062E682507A3525AD29C3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5ED314E5945CE0FD631D7A3525AE06CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_056A2AFFC439DB0921957A3525AE786E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5ED314E5945CE0FD631D7A3525AE06CB" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_056A2AFFC439DB0921957A3525AE786E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_056A2AFFC439DB0921957A3525AE786E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5ED314E5945CE0FD631D7A3525AE06CB" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_056A2AFFC439DB0921957A3525AE786E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringAndNonrecurringBasisTableTextBlock" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringAndNonrecurringBasisTableTextBlock_073CEB486DD9674FA0957A3525AF7485" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6CC61BA2507762AFBE497A3525AF6494" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringAndNonrecurringBasisTableTextBlock_073CEB486DD9674FA0957A3525AF7485" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/GoodwillAndOtherIntangibleAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/GoodwillAndOtherIntangibleAssetsDetailsTextual" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/GoodwillAndOtherIntangibleAssetsTableTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/IncomeTaxesEffectiveTaxRateDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/IncomeTaxesNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/Investments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/InvestmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_362CC412071980E73F6C7A3525BDF42B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_40B968F7C591C518A65A7A3525BBEE8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_362CC412071980E73F6C7A3525BDF42B" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_40B968F7C591C518A65A7A3525BBEE8B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_C07CD1AF932F599624467A3525BBCBE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_40B968F7C591C518A65A7A3525BBEE8B" xlink:to="loc_us-gaap_InvestmentTypeAxis_C07CD1AF932F599624467A3525BBCBE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_C07CD1AF932F599624467A3525BBCBE5" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_C07CD1AF932F599624467A3525BBCBE5" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_81F5BAAD1B3A85849AB57A3525BC6F13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_81F5BAAD1B3A85849AB57A3525BC6F13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_36EF54EF811A736EBE4B7A3525BC7F95" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145" xlink:to="loc_us-gaap_MoneyMarketFundsMember_36EF54EF811A736EBE4B7A3525BC7F95" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityFundsMember" xlink:label="loc_us-gaap_EquityFundsMember_AB212A190BCBF354A1F57A3525BCEF99" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_8CFDA2DE9EF94A8A3E377A3525BB0145" xlink:to="loc_us-gaap_EquityFundsMember_AB212A190BCBF354A1F57A3525BCEF99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecuritiesCost" xlink:label="loc_us-gaap_TradingSecuritiesCost_E78CB627F8E5A0D6B9FC7A3525BD6647" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_362CC412071980E73F6C7A3525BDF42B" xlink:to="loc_us-gaap_TradingSecuritiesCost_E78CB627F8E5A0D6B9FC7A3525BD6647" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecuritiesUnrealizedHoldingGain" xlink:label="loc_us-gaap_TradingSecuritiesUnrealizedHoldingGain_E94502CD79FC6CDCCFBA7A3525BDB50F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_362CC412071980E73F6C7A3525BDF42B" xlink:to="loc_us-gaap_TradingSecuritiesUnrealizedHoldingGain_E94502CD79FC6CDCCFBA7A3525BDB50F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecuritiesUnrealizedHoldingLoss" xlink:label="loc_us-gaap_TradingSecuritiesUnrealizedHoldingLoss_AF568A5FD8CED492DFB37A3525BEB941" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_362CC412071980E73F6C7A3525BDF42B" xlink:to="loc_us-gaap_TradingSecuritiesUnrealizedHoldingLoss_AF568A5FD8CED492DFB37A3525BEB941" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecurities" xlink:label="loc_us-gaap_TradingSecurities_C37B5294C53FED8776297A3525BEABA6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_362CC412071980E73F6C7A3525BDF42B" xlink:to="loc_us-gaap_TradingSecurities_C37B5294C53FED8776297A3525BEABA6" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/InvestmentsDetailsTextual" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_F767190AF31407517CB03F2B49DC9CA4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_F767190AF31407517CB03F2B49DC9CA4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_0DCC326A2FE3DAE20BF83F2B49DC2A5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_F767190AF31407517CB03F2B49DC9CA4" xlink:to="loc_us-gaap_InvestmentTypeAxis_0DCC326A2FE3DAE20BF83F2B49DC2A5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_0DCC326A2FE3DAE20BF83F2B49DC2A5E" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_0DCC326A2FE3DAE20BF83F2B49DC2A5E" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityFundsMember" xlink:label="loc_us-gaap_EquityFundsMember_8E195F868084CBF1A5043F2B49DDFDCB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460" xlink:to="loc_us-gaap_EquityFundsMember_8E195F868084CBF1A5043F2B49DDFDCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_10D1CD144930098AEEE83F2B49DD36F4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460" xlink:to="loc_us-gaap_MoneyMarketFundsMember_10D1CD144930098AEEE83F2B49DD36F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PrivateEquityFundsMember" xlink:label="loc_us-gaap_PrivateEquityFundsMember_053607C1A6E57D4D07A23F2B49DDC23C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_44A22BBA4D2276B03CA63F2B49DDE460" xlink:to="loc_us-gaap_PrivateEquityFundsMember_053607C1A6E57D4D07A23F2B49DDC23C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_24EE4F22A971F7D399D43F2B49DE6703" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_F767190AF31407517CB03F2B49DC9CA4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_24EE4F22A971F7D399D43F2B49DE6703" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_F2722FDE476B2B1300143F2B49DE1816_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_24EE4F22A971F7D399D43F2B49DE6703" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_F2722FDE476B2B1300143F2B49DE1816_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_F2722FDE476B2B1300143F2B49DE1816" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_24EE4F22A971F7D399D43F2B49DE6703" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_F2722FDE476B2B1300143F2B49DE1816" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_USTreasuryAndGovernmentMember" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_23EFEB0995D00764327C3F2B49DE4B2B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_F2722FDE476B2B1300143F2B49DE1816" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_23EFEB0995D00764327C3F2B49DE4B2B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_1868E1EDBA98207181AA3F2B49DE2CFC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_F767190AF31407517CB03F2B49DC9CA4" xlink:to="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_1868E1EDBA98207181AA3F2B49DE2CFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_C5CF73C4B0DD67E7A9FD3F2B49DF924E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_1868E1EDBA98207181AA3F2B49DE2CFC" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_C5CF73C4B0DD67E7A9FD3F2B49DF924E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_C5CF73C4B0DD67E7A9FD3F2B49DF924E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_1868E1EDBA98207181AA3F2B49DE2CFC" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_C5CF73C4B0DD67E7A9FD3F2B49DF924E" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_VariableInterestEntityMember" xlink:label="loc_whg_VariableInterestEntityMember_78EEF29433F8FF5BA7BB3F2B49DFB6C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_C5CF73C4B0DD67E7A9FD3F2B49DF924E" xlink:to="loc_whg_VariableInterestEntityMember_78EEF29433F8FF5BA7BB3F2B49DFB6C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="loc_us-gaap_LongTermInvestments_3EEFB7F7DDF9732A83C93F2B49DFE99D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_LongTermInvestments_3EEFB7F7DDF9732A83C93F2B49DFE99D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecuritiesCost" xlink:label="loc_us-gaap_TradingSecuritiesCost_306677092E114BD08C383F2B49E03A38" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_TradingSecuritiesCost_306677092E114BD08C383F2B49E03A38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecuritiesUnrealizedHoldingGain" xlink:label="loc_us-gaap_TradingSecuritiesUnrealizedHoldingGain_53B1993E09F5EADF04BB3F2B49E06440" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_TradingSecuritiesUnrealizedHoldingGain_53B1993E09F5EADF04BB3F2B49E06440" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecuritiesUnrealizedHoldingLoss" xlink:label="loc_us-gaap_TradingSecuritiesUnrealizedHoldingLoss_3282474DEE1CE512A8C63F2B49E000EE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_TradingSecuritiesUnrealizedHoldingLoss_3282474DEE1CE512A8C63F2B49E000EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_279153744D5B0A8DB9A33F2B49E0BBEF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_ShortTermInvestments_279153744D5B0A8DB9A33F2B49E0BBEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecurities" xlink:label="loc_us-gaap_TradingSecurities_1F27D181E46590E442D73F2B49E082A1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_TradingSecurities_1F27D181E46590E442D73F2B49E082A1" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_Investmentscarriedatfairvaluecost" xlink:label="loc_whg_Investmentscarriedatfairvaluecost_60A6457B80E66350222F3F2B49E016F4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_whg_Investmentscarriedatfairvaluecost_60A6457B80E66350222F3F2B49E016F4" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_Investmentscarriedatfairvalueunrealizedgain" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedgain_0EA235C4AA51ED75B0EE3F2B49E103E0" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedgain_0EA235C4AA51ED75B0EE3F2B49E103E0" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_Investmentscarriedatfairvalueunrealizedloss" xlink:label="loc_whg_Investmentscarriedatfairvalueunrealizedloss_1EB6A313F7B3DEE9C6E63F2B49E65361" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_whg_Investmentscarriedatfairvalueunrealizedloss_1EB6A313F7B3DEE9C6E63F2B49E65361" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquitySecuritiesFvNiCost" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCost_814F40B69570F03D13D33F2B49E61324" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCost_814F40B69570F03D13D33F2B49E61324" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGain" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_8CCC247D16F6717BCB053F2B49E6FD83" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_8CCC247D16F6717BCB053F2B49E6FD83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedLoss" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedLoss_6A52BF75AEBC5C990FA23F2B49E6A118" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedLoss_6A52BF75AEBC5C990FA23F2B49E6A118" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_Investmentinprivatefund" xlink:label="loc_whg_Investmentinprivatefund_0EDA059B7985EB1CD2FA3F2B49E76F25" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_DEC43FC4C8E6EFCE96E93F2B49DF6E5B" xlink:to="loc_whg_Investmentinprivatefund_0EDA059B7985EB1CD2FA3F2B49E76F25" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/InvestmentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LeasesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_AAD6C19FE1AD3A05310B3F2B48D74869" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_85B35FF27E0F3FCAA02D3F2B48D69B8C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_AAD6C19FE1AD3A05310B3F2B48D74869" xlink:to="loc_us-gaap_StatementTable_85B35FF27E0F3FCAA02D3F2B48D69B8C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_3FB79DA2C75BE9F7A5B83F2B48D64C1F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_85B35FF27E0F3FCAA02D3F2B48D69B8C" xlink:to="loc_srt_RangeAxis_3FB79DA2C75BE9F7A5B83F2B48D64C1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_3B64D9232EFEB9CF61793F2B48D67422_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3FB79DA2C75BE9F7A5B83F2B48D64C1F" xlink:to="loc_srt_RangeMember_3B64D9232EFEB9CF61793F2B48D67422_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_3B64D9232EFEB9CF61793F2B48D67422" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3FB79DA2C75BE9F7A5B83F2B48D64C1F" xlink:to="loc_srt_RangeMember_3B64D9232EFEB9CF61793F2B48D67422" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_DF839D35EAD41295F0283F2B48D7E5E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3B64D9232EFEB9CF61793F2B48D67422" xlink:to="loc_srt_MinimumMember_DF839D35EAD41295F0283F2B48D7E5E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_BE739EE1D66378E79FFA3F2B48D76BA9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3B64D9232EFEB9CF61793F2B48D67422" xlink:to="loc_srt_MaximumMember_BE739EE1D66378E79FFA3F2B48D76BA9" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_Corporateofficesremainingleaseterms" xlink:label="loc_whg_Corporateofficesremainingleaseterms_CB08E52E08ADCC32EEFF3F2B48D7BF8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AAD6C19FE1AD3A05310B3F2B48D74869" xlink:to="loc_whg_Corporateofficesremainingleaseterms_CB08E52E08ADCC32EEFF3F2B48D7BF8B" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_SubleaseTerm" xlink:label="loc_whg_SubleaseTerm_EB9B581C62F2BC3A6DF53F3B69E417BD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_AAD6C19FE1AD3A05310B3F2B48D74869" xlink:to="loc_whg_SubleaseTerm_EB9B581C62F2BC3A6DF53F3B69E417BD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LeasesNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LeasesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LongTermIncentiveCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F13119F1FE48889899AE7A35272B4BB2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_14776971C39A752BC1D47A3527287513" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F13119F1FE48889899AE7A35272B4BB2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_14776971C39A752BC1D47A3527287513" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_007807A2D8CC0B0962CB7A3527290528" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_14776971C39A752BC1D47A3527287513" xlink:to="loc_us-gaap_AwardTypeAxis_007807A2D8CC0B0962CB7A3527290528" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_007807A2D8CC0B0962CB7A3527290528" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_007807A2D8CC0B0962CB7A3527290528" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_DomesticEmployeeServiceAwardMember" xlink:label="loc_whg_DomesticEmployeeServiceAwardMember_0075E5B0AA25954B6BD27A35272946B2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:to="loc_whg_DomesticEmployeeServiceAwardMember_0075E5B0AA25954B6BD27A35272946B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_C4FDAC2E4A9E86CDC10A7A35272A013C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:to="loc_us-gaap_PerformanceSharesMember_C4FDAC2E4A9E86CDC10A7A35272A013C" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_DomesticServiceAndPerformanceAwardMember" xlink:label="loc_whg_DomesticServiceAndPerformanceAwardMember_7FABDD12BC9A40FBFB8B7A35272A02EA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:to="loc_whg_DomesticServiceAndPerformanceAwardMember_7FABDD12BC9A40FBFB8B7A35272A02EA" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_CanadianEmployeeServiceAwardMember" xlink:label="loc_whg_CanadianEmployeeServiceAwardMember_61BB81B393C285FC528E7A35272AD4E6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:to="loc_whg_CanadianEmployeeServiceAwardMember_61BB81B393C285FC528E7A35272AD4E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_9F5D6CEE9010A03789667A35272A6BB5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2691B6D4C8BA9EFD1C8D7A352729E165" xlink:to="loc_us-gaap_RestrictedStockMember_9F5D6CEE9010A03789667A35272A6BB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_7F71380B3BC36B8E0C5F7A35272A533A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_14776971C39A752BC1D47A3527287513" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_7F71380B3BC36B8E0C5F7A35272A533A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_120E2E60C77A3DA64C947A35272A4045_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7F71380B3BC36B8E0C5F7A35272A533A" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_120E2E60C77A3DA64C947A35272A4045_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_120E2E60C77A3DA64C947A35272A4045" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7F71380B3BC36B8E0C5F7A35272A533A" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_120E2E60C77A3DA64C947A35272A4045" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_2EB5FE7313B99555BBA67A35272B1B8B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_14776971C39A752BC1D47A3527287513" xlink:to="loc_us-gaap_PlanNameAxis_2EB5FE7313B99555BBA67A35272B1B8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_875D696668628B621A377A35272BB24E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_2EB5FE7313B99555BBA67A35272B1B8B" xlink:to="loc_us-gaap_PlanNameDomain_875D696668628B621A377A35272BB24E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_875D696668628B621A377A35272BB24E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_2EB5FE7313B99555BBA67A35272B1B8B" xlink:to="loc_us-gaap_PlanNameDomain_875D696668628B621A377A35272BB24E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_596D6E6798C0D2FD033B7A35272CBA7D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F13119F1FE48889899AE7A35272B4BB2" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_596D6E6798C0D2FD033B7A35272CBA7D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetails1" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3691D7AFB26DBA0F87C57A3526C8BE51" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0956FDA7355A73CEDF817A3526C62F62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3691D7AFB26DBA0F87C57A3526C8BE51" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0956FDA7355A73CEDF817A3526C62F62" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9753CB536E1A72C4171F7A3526C72916" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0956FDA7355A73CEDF817A3526C62F62" xlink:to="loc_us-gaap_AwardTypeAxis_9753CB536E1A72C4171F7A3526C72916" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D0135FC05D5010816B2D7A3526C75105_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9753CB536E1A72C4171F7A3526C72916" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D0135FC05D5010816B2D7A3526C75105_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D0135FC05D5010816B2D7A3526C75105" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9753CB536E1A72C4171F7A3526C72916" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D0135FC05D5010816B2D7A3526C75105" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_C1FE87281F1F654E54D87A3526C78C93" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D0135FC05D5010816B2D7A3526C75105" xlink:to="loc_us-gaap_RestrictedStockMember_C1FE87281F1F654E54D87A3526C78C93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3691D7AFB26DBA0F87C57A3526C8BE51" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_667E7B8B4372993236E37A3526C888F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_667E7B8B4372993236E37A3526C888F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6E88772642147A58A7677A3526C8D59F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6E88772642147A58A7677A3526C8D59F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_64EE7EC31E336AEC20377A3526C8C5B4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_64EE7EC31E336AEC20377A3526C8C5B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_ECF992B6E182606C576C7A3526C8DDEC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_ECF992B6E182606C576C7A3526C8DDEC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_5316087C5C644DD8EA3B7A3526C94EA8" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_5316087C5C644DD8EA3B7A3526C94EA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_48685BA27A4DDDD2F4337A3526C93639" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_48685BA27A4DDDD2F4337A3526C93639" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_1B96658DAE27B43E7DC57A3526C91FE7" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_1B96658DAE27B43E7DC57A3526C91FE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_658478DCC3F8EBA9BEB07A3526C96AF8" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_439F92705FBA3D94F0387A3526C8BAEE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_658478DCC3F8EBA9BEB07A3526C96AF8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetails2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_14FE3A90102EF25DB19C7A3525EEE307" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F0C5249E523B79093877A3525ED952F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_14FE3A90102EF25DB19C7A3525EEE307" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F0C5249E523B79093877A3525ED952F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_964D1927B3AF46F857B37A3525ED698D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F0C5249E523B79093877A3525ED952F" xlink:to="loc_us-gaap_AwardTypeAxis_964D1927B3AF46F857B37A3525ED698D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_24909F0CD123A7BF62B07A3525EE26C9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_964D1927B3AF46F857B37A3525ED698D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_24909F0CD123A7BF62B07A3525EE26C9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_24909F0CD123A7BF62B07A3525EE26C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_964D1927B3AF46F857B37A3525ED698D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_24909F0CD123A7BF62B07A3525EE26C9" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember" xlink:label="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_80D89D13A4FFAF6703C57A3525EE342E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_24909F0CD123A7BF62B07A3525EE26C9" xlink:to="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_80D89D13A4FFAF6703C57A3525EE342E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_14FE3A90102EF25DB19C7A3525EEE307" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_F12DF524CCA5B8F445147A3525EFBB71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_F12DF524CCA5B8F445147A3525EFBB71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_D6C6B5C43F8CCEF611CC7A3525EF3D63" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_D6C6B5C43F8CCEF611CC7A3525EF3D63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_519E5F45A858C0A483CA7A3525EF1D0E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_519E5F45A858C0A483CA7A3525EF1D0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_356424F640E9B855BACB7A3525EF941C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_356424F640E9B855BACB7A3525EF941C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_418DB1755A466A3387A67A3525F029B5" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_418DB1755A466A3387A67A3525F029B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3AE92A630F4C6762B76B7A3525F0B9B9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3AE92A630F4C6762B76B7A3525F0B9B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6E1A7ACC47C6438786F57A3525F0CB1C" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6E1A7ACC47C6438786F57A3525F0CB1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_08A4A61C87DCEE7BC2927A3525F09E6E" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7DBDA5BFE5EFD107EA947A3525EE9FBE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_08A4A61C87DCEE7BC2927A3525F09E6E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LongTermIncentiveCompensationDetailsTextual" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_AC91BABE73A020105B374861BC615BBB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:to="loc_us-gaap_VestingAxis_AC91BABE73A020105B374861BC615BBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_CE32E55E71118667AC914861BC610DAD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_AC91BABE73A020105B374861BC615BBB" xlink:to="loc_us-gaap_VestingDomain_CE32E55E71118667AC914861BC610DAD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_CE32E55E71118667AC914861BC610DAD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_AC91BABE73A020105B374861BC615BBB" xlink:to="loc_us-gaap_VestingDomain_CE32E55E71118667AC914861BC610DAD" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TargetAxis" xlink:label="loc_whg_TargetAxis_4188EA60B98F598824754861BC617837" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:to="loc_whg_TargetAxis_4188EA60B98F598824754861BC617837" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TargetDomain" xlink:label="loc_whg_TargetDomain_30378887164EDADF451E4861BC618ED5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_whg_TargetAxis_4188EA60B98F598824754861BC617837" xlink:to="loc_whg_TargetDomain_30378887164EDADF451E4861BC618ED5_default" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TargetDomain" xlink:label="loc_whg_TargetDomain_30378887164EDADF451E4861BC618ED5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_whg_TargetAxis_4188EA60B98F598824754861BC617837" xlink:to="loc_whg_TargetDomain_30378887164EDADF451E4861BC618ED5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_27D02AA0CFE80530EA714861BC62A58C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:to="loc_srt_RangeAxis_27D02AA0CFE80530EA714861BC62A58C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_9F5C307FA56CBD1DE5D64861BC622072_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_27D02AA0CFE80530EA714861BC62A58C" xlink:to="loc_srt_RangeMember_9F5C307FA56CBD1DE5D64861BC622072_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_9F5C307FA56CBD1DE5D64861BC622072" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_27D02AA0CFE80530EA714861BC62A58C" xlink:to="loc_srt_RangeMember_9F5C307FA56CBD1DE5D64861BC622072" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_AA238159B1B7AE51FEDC4861BC62ADA5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:to="loc_us-gaap_AwardTypeAxis_AA238159B1B7AE51FEDC4861BC62ADA5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_042656D21265585763C74861BC62EEB8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_AA238159B1B7AE51FEDC4861BC62ADA5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_042656D21265585763C74861BC62EEB8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_042656D21265585763C74861BC62EEB8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_AA238159B1B7AE51FEDC4861BC62ADA5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_042656D21265585763C74861BC62EEB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_744679C53C94C84DBA974861BC63BC6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_042656D21265585763C74861BC62EEB8" xlink:to="loc_us-gaap_RestrictedStockMember_744679C53C94C84DBA974861BC63BC6D" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_CanadianPlanMember" xlink:label="loc_whg_CanadianPlanMember_688B0451084D3722741D4861BC63E68A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_042656D21265585763C74861BC62EEB8" xlink:to="loc_whg_CanadianPlanMember_688B0451084D3722741D4861BC63E68A" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_AC9BF507E3FAD06C68E94861BC633761" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:to="loc_dei_LegalEntityAxis_AC9BF507E3FAD06C68E94861BC633761" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4296AFAD287C3B106EF94861BC63D57D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_AC9BF507E3FAD06C68E94861BC633761" xlink:to="loc_dei_EntityDomain_4296AFAD287C3B106EF94861BC63D57D_default" xlink:type="arc" />
    <link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_4296AFAD287C3B106EF94861BC63D57D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_AC9BF507E3FAD06C68E94861BC633761" xlink:to="loc_dei_EntityDomain_4296AFAD287C3B106EF94861BC63D57D" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_WestwoodInternationalAdvisorsIncMember" xlink:label="loc_whg_WestwoodInternationalAdvisorsIncMember_9144B6AE606CAF7136DB4861BC648BAE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4296AFAD287C3B106EF94861BC63D57D" xlink:to="loc_whg_WestwoodInternationalAdvisorsIncMember_9144B6AE606CAF7136DB4861BC648BAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5DB9A94A5DAF172F0F6B4861BC64776E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_E50D2C644EBF07C12C6F4861BC608043" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5DB9A94A5DAF172F0F6B4861BC64776E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_4BC980C2721396021F394861BC642A82_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5DB9A94A5DAF172F0F6B4861BC64776E" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_4BC980C2721396021F394861BC642A82_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_4BC980C2721396021F394861BC642A82" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_5DB9A94A5DAF172F0F6B4861BC64776E" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_4BC980C2721396021F394861BC642A82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MutualFundMember" xlink:label="loc_us-gaap_MutualFundMember_3C948403BD828AF47ACD4861BC6434CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4BC980C2721396021F394861BC642A82" xlink:to="loc_us-gaap_MutualFundMember_3C948403BD828AF47ACD4861BC6434CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_DD2CA05D5158891DCE8B4861BC6578FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_DD2CA05D5158891DCE8B4861BC6578FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_F57633098C8783E34A8D4861BC65404E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_F57633098C8783E34A8D4861BC65404E" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal" xlink:label="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal_2D222A60134902F0DEA54861BC6601FE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrantOriginal_2D222A60134902F0DEA54861BC6601FE" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_FundPurchasesOfCommonStock" xlink:label="loc_whg_FundPurchasesOfCommonStock_FFC839DF3FBB5859B8434861BC669516" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_whg_FundPurchasesOfCommonStock_FFC839DF3FBB5859B8434861BC669516" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant" xlink:label="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant_AEFC520BF1DE28BEF6A74861BC6654EE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_whg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAvailableForGrant_AEFC520BF1DE28BEF6A74861BC6654EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_F120F6D0A61549068D834861BC666E06" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_SharePrice_F120F6D0A61549068D834861BC666E06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_00811BC4D1266DF97DDA4861BC661D4F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_00811BC4D1266DF97DDA4861BC661D4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_521B48159AC46908A6924861BC6623DB" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_521B48159AC46908A6924861BC6623DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_10861687D97ECF6A4AF54861BC679EB3" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_10861687D97ECF6A4AF54861BC679EB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_7118519E36AF850A6F304861BC67EC7E" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_7118519E36AF850A6F304861BC67EC7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_112ED327D2D7B0A47A2A4861BC67B777" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_112ED327D2D7B0A47A2A4861BC67B777" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7E2CCFA3BC9DA260E4D84861BC68E5E9" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_7E2CCFA3BC9DA260E4D84861BC68E5E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_0DEE3C811DBA666770F64861BC685F92" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_0DEE3C811DBA666770F64861BC685F92" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_MutualFundIncentiveAwardLiability" xlink:label="loc_whg_MutualFundIncentiveAwardLiability_2D5D386E27B2BF3D9D994861BC68142B" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_AD74B1683A50CDEAC9884861BC655881" xlink:to="loc_whg_MutualFundIncentiveAwardLiability_2D5D386E27B2BF3D9D994861BC68142B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/LongTermIncentiveCompensationTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82615A5ADD9F71187B3F2A01D7B48706" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_986FE6F6C4CCDE0E52C92A01D7B3D241" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82615A5ADD9F71187B3F2A01D7B48706" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_986FE6F6C4CCDE0E52C92A01D7B3D241" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_74EC8F6362DADA70E2202A01D7B3F89B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_986FE6F6C4CCDE0E52C92A01D7B3D241" xlink:to="loc_us-gaap_AwardTypeAxis_74EC8F6362DADA70E2202A01D7B3F89B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_79137721DED667C8F0172A01D7B408F3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_74EC8F6362DADA70E2202A01D7B3F89B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_79137721DED667C8F0172A01D7B408F3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_79137721DED667C8F0172A01D7B408F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_74EC8F6362DADA70E2202A01D7B3F89B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_79137721DED667C8F0172A01D7B408F3" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RestrictedStockSubjectOnlyToServiceConditionMember" xlink:label="loc_whg_RestrictedStockSubjectOnlyToServiceConditionMember_A983E0ED884D1D7872422A01D7B4C227" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_79137721DED667C8F0172A01D7B408F3" xlink:to="loc_whg_RestrictedStockSubjectOnlyToServiceConditionMember_A983E0ED884D1D7872422A01D7B4C227" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember" xlink:label="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_B3DAD9F0B856967029D02A01D7B4DAC6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_79137721DED667C8F0172A01D7B408F3" xlink:to="loc_whg_RestrictedSharesSubjectToServiceAndPerformanceConditionsMember_B3DAD9F0B856967029D02A01D7B4DAC6" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock" xlink:label="loc_whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock_CF4CC0870F9A0791F3B22A04EC3C2460" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82615A5ADD9F71187B3F2A01D7B48706" xlink:to="loc_whg_RestrictedStockSubjectOnlyToAServiceConditionPolicyTextBlock_CF4CC0870F9A0791F3B22A04EC3C2460" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_ADB5F6A9DB4AF6D912322A01D7B449BF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82615A5ADD9F71187B3F2A01D7B48706" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_ADB5F6A9DB4AF6D912322A01D7B449BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_72F1C8A2B138989F84322A01D7B5A5B8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82615A5ADD9F71187B3F2A01D7B48706" xlink:to="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_72F1C8A2B138989F84322A01D7B5A5B8" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock" xlink:label="loc_whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock_8E4E797FFBA0D59CCE612A04AC5BA3F4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_82615A5ADD9F71187B3F2A01D7B48706" xlink:to="loc_whg_RestrictedStockSubjectToServiceAndPerformanceConditionsPolicyTextBlock_8E4E797FFBA0D59CCE612A04AC5BA3F4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RelatedPartyTransactionsDetailsTextual" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_728F5299595B86728AC443ED5B570BD7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_A5725AFD8D2A9BC60E5943ED5B528727" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_728F5299595B86728AC443ED5B570BD7" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_A5725AFD8D2A9BC60E5943ED5B528727" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_8F5739E62FD307874B0D43ED5B5473D9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_A5725AFD8D2A9BC60E5943ED5B528727" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_8F5739E62FD307874B0D43ED5B5473D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_044168A72838E5ECE26C43ED5B54E1A5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_8F5739E62FD307874B0D43ED5B5473D9" xlink:to="loc_us-gaap_RelatedPartyDomain_044168A72838E5ECE26C43ED5B54E1A5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_044168A72838E5ECE26C43ED5B54E1A5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_8F5739E62FD307874B0D43ED5B5473D9" xlink:to="loc_us-gaap_RelatedPartyDomain_044168A72838E5ECE26C43ED5B54E1A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TrustForBenefitOfEmployeesMember" xlink:label="loc_us-gaap_TrustForBenefitOfEmployeesMember_1B0EBD9FBF8B7097D12E43ED5B558F4D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_044168A72838E5ECE26C43ED5B54E1A5" xlink:to="loc_us-gaap_TrustForBenefitOfEmployeesMember_1B0EBD9FBF8B7097D12E43ED5B558F4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_DF6EAABAFB4805E0F46243ED5B55DE7A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_A5725AFD8D2A9BC60E5943ED5B528727" xlink:to="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_DF6EAABAFB4805E0F46243ED5B55DE7A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_EED99FFF4562CA8B5E6043ED5B5687DA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_DF6EAABAFB4805E0F46243ED5B55DE7A" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_EED99FFF4562CA8B5E6043ED5B5687DA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_EED99FFF4562CA8B5E6043ED5B5687DA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_DF6EAABAFB4805E0F46243ED5B55DE7A" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_EED99FFF4562CA8B5E6043ED5B5687DA" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_277223AAEB894406BA6F43ED5B5697EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_EED99FFF4562CA8B5E6043ED5B5687DA" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_277223AAEB894406BA6F43ED5B5697EC" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PrivateEquityInvestmentsMember" xlink:label="loc_whg_PrivateEquityInvestmentsMember_249DFBA8B3C8D6D1506143ED5B56F411" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_EED99FFF4562CA8B5E6043ED5B5687DA" xlink:to="loc_whg_PrivateEquityInvestmentsMember_249DFBA8B3C8D6D1506143ED5B56F411" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromRelatedParties" xlink:label="loc_us-gaap_DueFromRelatedParties_58A3F6067F098008037743ED5B57BE7E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_728F5299595B86728AC443ED5B570BD7" xlink:to="loc_us-gaap_DueFromRelatedParties_58A3F6067F098008037743ED5B57BE7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromRelatedParties" xlink:label="loc_us-gaap_RevenueFromRelatedParties_28F33A56F1E23FFAEE9343ED5B57F4FE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_728F5299595B86728AC443ED5B570BD7" xlink:to="loc_us-gaap_RevenueFromRelatedParties_28F33A56F1E23FFAEE9343ED5B57F4FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_8E2909EBFFB8225FE38843ED5B570FEB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_728F5299595B86728AC443ED5B570BD7" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_8E2909EBFFB8225FE38843ED5B570FEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_5FD82D1EAC8888CBBD6B43ED5B570A99" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_728F5299595B86728AC443ED5B570BD7" xlink:to="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_5FD82D1EAC8888CBBD6B43ED5B570A99" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RevenueDisaggregationOfRevenueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_2B2B61D129D5BD2B987A7A3527245AEC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_FA0A2ECBD3F00CC823D47A35271EE84F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2B2B61D129D5BD2B987A7A3527245AEC" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_FA0A2ECBD3F00CC823D47A35271EE84F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_6C0C2F06E43299DD88447A35271FF963" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_FA0A2ECBD3F00CC823D47A35271EE84F" xlink:to="loc_srt_ProductOrServiceAxis_6C0C2F06E43299DD88447A35271FF963" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_6C0C2F06E43299DD88447A35271FF963" xlink:to="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_6C0C2F06E43299DD88447A35271FF963" xlink:to="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_InvestmentAdvisoryServicesMember" xlink:label="loc_whg_InvestmentAdvisoryServicesMember_D3F839FE4A95947791757A35271F2ED3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:to="loc_whg_InvestmentAdvisoryServicesMember_D3F839FE4A95947791757A35271F2ED3" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_MutualFundAdvisoryMemberMember" xlink:label="loc_whg_MutualFundAdvisoryMemberMember_38DCF3D1439E36EC75DB7A352720707D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:to="loc_whg_MutualFundAdvisoryMemberMember_38DCF3D1439E36EC75DB7A352720707D" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PrivateWealthAdvisoryMember" xlink:label="loc_whg_PrivateWealthAdvisoryMember_954316F1CBD417EE8B7F7A35272091A6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:to="loc_whg_PrivateWealthAdvisoryMember_954316F1CBD417EE8B7F7A35272091A6" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PerformancefeeMember" xlink:label="loc_whg_PerformancefeeMember_4C8C2EB919479B24CFD87A352720274A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:to="loc_whg_PerformancefeeMember_4C8C2EB919479B24CFD87A352720274A" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TrustFeeMember" xlink:label="loc_whg_TrustFeeMember_6777C212ACF78BF59E287A352720BCC8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:to="loc_whg_TrustFeeMember_6777C212ACF78BF59E287A352720BCC8" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_OtherRevenueMiscServicesMember" xlink:label="loc_whg_OtherRevenueMiscServicesMember_E417AABA80E029B9F9A97A352721A41C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1BE4D92C72039F007AAD7A35271F75D0" xlink:to="loc_whg_OtherRevenueMiscServicesMember_E417AABA80E029B9F9A97A352721A41C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_DABA4056D556DEA0DB5F7A35272120D4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_FA0A2ECBD3F00CC823D47A35271EE84F" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_DABA4056D556DEA0DB5F7A35272120D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_A22D33DA94069EA116D97A352721C38A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_DABA4056D556DEA0DB5F7A35272120D4" xlink:to="loc_us-gaap_SegmentDomain_A22D33DA94069EA116D97A352721C38A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_A22D33DA94069EA116D97A352721C38A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_DABA4056D556DEA0DB5F7A35272120D4" xlink:to="loc_us-gaap_SegmentDomain_A22D33DA94069EA116D97A352721C38A" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TrustMember" xlink:label="loc_whg_TrustMember_4F68DD2A15940FDC18977A3527216F79" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_A22D33DA94069EA116D97A352721C38A" xlink:to="loc_whg_TrustMember_4F68DD2A15940FDC18977A3527216F79" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_AdvisoryMember" xlink:label="loc_whg_AdvisoryMember_35F9AE81B6871AD15DFE7A352721CA33" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_A22D33DA94069EA116D97A352721C38A" xlink:to="loc_whg_AdvisoryMember_35F9AE81B6871AD15DFE7A352721CA33" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_133AEC6B66A38B2B35777A3527228668" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_FA0A2ECBD3F00CC823D47A35271EE84F" xlink:to="loc_srt_StatementGeographicalAxis_133AEC6B66A38B2B35777A3527228668" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_133AEC6B66A38B2B35777A3527228668" xlink:to="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_133AEC6B66A38B2B35777A3527228668" xlink:to="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_AsiaMember" xlink:label="loc_srt_AsiaMember_71A0A0749DB7D58D5CA27A35272221D4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:to="loc_srt_AsiaMember_71A0A0749DB7D58D5CA27A35272221D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_AU" xlink:label="loc_country_AU_F8DE5B235326389B845C7A352723052E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:to="loc_country_AU_F8DE5B235326389B845C7A352723052E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_CA" xlink:label="loc_country_CA_C191E7F5F4795A1DA0407A3527234A5D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:to="loc_country_CA_C191E7F5F4795A1DA0407A3527234A5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_EuropeMember" xlink:label="loc_srt_EuropeMember_F22A4DCB2833A2A198D27A352723475D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:to="loc_srt_EuropeMember_F22A4DCB2833A2A198D27A352723475D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_F461A14C4C49071A22147A352723069D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_AF78AC82FD20592752E07A352722ACFA" xlink:to="loc_country_US_F461A14C4C49071A22147A352723069D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelAxis" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_3BD8371EDA554CC68B527A352723D198" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_FA0A2ECBD3F00CC823D47A35271EE84F" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_3BD8371EDA554CC68B527A352723D198" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_C87A158CED2A32B24FE87A352723E917_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_3BD8371EDA554CC68B527A352723D198" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_C87A158CED2A32B24FE87A352723E917_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_C87A158CED2A32B24FE87A352723E917" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_3BD8371EDA554CC68B527A352723D198" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_C87A158CED2A32B24FE87A352723E917" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_BC4D300256E576221E817A352724EE0C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2B2B61D129D5BD2B987A7A3527245AEC" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_BC4D300256E576221E817A352724EE0C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RevenueNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RevenuePoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/RevenueTableTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SegmentReporting" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SegmentReportingDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_245D014B3454BB3FC5833F2238E73A40" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_245D014B3454BB3FC5833F2238E73A40" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_C217B1CA70DAC760F0143F2238E7DEA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_245D014B3454BB3FC5833F2238E73A40" xlink:to="loc_us-gaap_AwardTypeAxis_C217B1CA70DAC760F0143F2238E7DEA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9BA2ED9893D2FB0545093F2238E85FF6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_C217B1CA70DAC760F0143F2238E7DEA6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9BA2ED9893D2FB0545093F2238E85FF6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9BA2ED9893D2FB0545093F2238E85FF6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_C217B1CA70DAC760F0143F2238E7DEA6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9BA2ED9893D2FB0545093F2238E85FF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_88EF57A187E11C1D2E483F2238E876A5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9BA2ED9893D2FB0545093F2238E85FF6" xlink:to="loc_us-gaap_RestrictedStockMember_88EF57A187E11C1D2E483F2238E876A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_340CC7C39A6D45F1493C3F2238E8B605" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_245D014B3454BB3FC5833F2238E73A40" xlink:to="loc_srt_ConsolidationItemsAxis_340CC7C39A6D45F1493C3F2238E8B605" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_340CC7C39A6D45F1493C3F2238E8B605" xlink:to="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_340CC7C39A6D45F1493C3F2238E8B605" xlink:to="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_2271F88AD812A98B5F4F3F2238EAD7E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888" xlink:to="loc_us-gaap_OperatingSegmentsMember_2271F88AD812A98B5F4F3F2238EAD7E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_8CF9DBE8335DA57C88B23F2238EA9BFB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888" xlink:to="loc_us-gaap_CorporateNonSegmentMember_8CF9DBE8335DA57C88B23F2238EA9BFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_C98A781F4D616B1110213F2238EB2E67" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_759D494EBE046F6BC6133F2238E91888" xlink:to="loc_us-gaap_IntersegmentEliminationMember_C98A781F4D616B1110213F2238EB2E67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_A971DEEE299183AF9BC53F2238EB86E2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_245D014B3454BB3FC5833F2238E73A40" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_A971DEEE299183AF9BC53F2238EB86E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_A971DEEE299183AF9BC53F2238EB86E2" xlink:to="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_A971DEEE299183AF9BC53F2238EB86E2" xlink:to="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_AdvisoryMember" xlink:label="loc_whg_AdvisoryMember_E193BC7652D67B3982763F2238EBFBA1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC" xlink:to="loc_whg_AdvisoryMember_E193BC7652D67B3982763F2238EBFBA1" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_TrustMember" xlink:label="loc_whg_TrustMember_83D6544ADC800D4AB8D33F2238EC3A31" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC" xlink:to="loc_whg_TrustMember_83D6544ADC800D4AB8D33F2238EC3A31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_10EBC9223CA4ED1B6EEA3F2238EC365E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC" xlink:to="loc_us-gaap_CorporateNonSegmentMember_10EBC9223CA4ED1B6EEA3F2238EC365E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_9BBE1B597A3901FFCF7E3F2238ED3AD0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_64D8403319F62F8ECDA23F2238EBF2FC" xlink:to="loc_us-gaap_IntersegmentEliminationMember_9BBE1B597A3901FFCF7E3F2238ED3AD0" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RevenueFromExternalSources" xlink:label="loc_whg_RevenueFromExternalSources_9AB927BAEBB4487769073F2238ED66D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_whg_RevenueFromExternalSources_9AB927BAEBB4487769073F2238ED66D8" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_ReconciliationFromNetIncomeToNonGaapMeasureTableTextBlock" xlink:label="loc_whg_ReconciliationFromNetIncomeToNonGaapMeasureTableTextBlock_690EE01DE73E85E0E2093F2238ED47C7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_whg_ReconciliationFromNetIncomeToNonGaapMeasureTableTextBlock_690EE01DE73E85E0E2093F2238ED47C7" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_NetIntersegmentRevenues" xlink:label="loc_whg_NetIntersegmentRevenues_15C9E3CDEF394446DA623F2238EEE24B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_whg_NetIntersegmentRevenues_15C9E3CDEF394446DA623F2238EEE24B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentIncomeNet" xlink:label="loc_us-gaap_InvestmentIncomeNet_5E39F991A37D922F167C3F2238EE73D0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_InvestmentIncomeNet_5E39F991A37D922F167C3F2238EE73D0" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_Otherrevenue" xlink:label="loc_whg_Otherrevenue_3617EA56EFBB6050706E3F2238EE17F0" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_whg_Otherrevenue_3617EA56EFBB6050706E3F2238EE17F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_BE0C1B6345FAB451C31C3F2238EF9836" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_Revenues_BE0C1B6345FAB451C31C3F2238EF9836" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_EconomicEarningsLosses" xlink:label="loc_whg_EconomicEarningsLosses_E7ACA7893CA8C61995DA3F2238EF7173" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_whg_EconomicEarningsLosses_E7ACA7893CA8C61995DA3F2238EF7173" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_EAE003A564BBADDE23E83F2238EF7E20" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_EAE003A564BBADDE23E83F2238EF7E20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_2D95C20992CB30027BB83F2238F06E48" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_2D95C20992CB30027BB83F2238F06E48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredOtherTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredOtherTaxExpenseBenefit_F50820811E7BE6F98DC03F2238F0B2D6" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_DeferredOtherTaxExpenseBenefit_F50820811E7BE6F98DC03F2238F0B2D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_157445F725AD919103303F2238F0B404" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_NetIncomeLoss_157445F725AD919103303F2238F0B404" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_59341C91809344625FEA3F2238F1D3A1" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_Assets_59341C91809344625FEA3F2238F1D3A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5556994C4131D3F232E53F2238F12993" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_04E515BF778CB3E4A4D13F2238EDC04C" xlink:to="loc_us-gaap_Goodwill_5556994C4131D3F232E53F2238F12993" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SegmentReportingDetailsTextual" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SegmentReportingTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_F31AA0EFDE6CA1DF47AD7A3525FCC3BC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6B04674191951CA6077F7A3525FA4A0C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_F31AA0EFDE6CA1DF47AD7A3525FCC3BC" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6B04674191951CA6077F7A3525FA4A0C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_D5FF4F7A666520A21ACC7A3525FAF2DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6B04674191951CA6077F7A3525FA4A0C" xlink:to="loc_srt_ConsolidationItemsAxis_D5FF4F7A666520A21ACC7A3525FAF2DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_40BBD8838C214C3CE7787A3525FB1937_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_D5FF4F7A666520A21ACC7A3525FAF2DB" xlink:to="loc_srt_ConsolidationItemsDomain_40BBD8838C214C3CE7787A3525FB1937_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_40BBD8838C214C3CE7787A3525FB1937" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_D5FF4F7A666520A21ACC7A3525FAF2DB" xlink:to="loc_srt_ConsolidationItemsDomain_40BBD8838C214C3CE7787A3525FB1937" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6601525D15EBFA1FAA517A3525FB347D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6B04674191951CA6077F7A3525FA4A0C" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6601525D15EBFA1FAA517A3525FB347D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_74CB9CCE86418773F68A7A3525FB52B2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6601525D15EBFA1FAA517A3525FB347D" xlink:to="loc_us-gaap_SegmentDomain_74CB9CCE86418773F68A7A3525FB52B2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_74CB9CCE86418773F68A7A3525FB52B2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6601525D15EBFA1FAA517A3525FB347D" xlink:to="loc_us-gaap_SegmentDomain_74CB9CCE86418773F68A7A3525FB52B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsAxis" xlink:label="loc_us-gaap_SubsegmentsAxis_C7E9DA8622A909DE88C37A3525FB41DB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6B04674191951CA6077F7A3525FA4A0C" xlink:to="loc_us-gaap_SubsegmentsAxis_C7E9DA8622A909DE88C37A3525FB41DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsDomain" xlink:label="loc_us-gaap_SubsegmentsDomain_A6A92DDE9AB58E4E90DD7A3525FB78F8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_C7E9DA8622A909DE88C37A3525FB41DB" xlink:to="loc_us-gaap_SubsegmentsDomain_A6A92DDE9AB58E4E90DD7A3525FB78F8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsDomain" xlink:label="loc_us-gaap_SubsegmentsDomain_A6A92DDE9AB58E4E90DD7A3525FB78F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_C7E9DA8622A909DE88C37A3525FB41DB" xlink:to="loc_us-gaap_SubsegmentsDomain_A6A92DDE9AB58E4E90DD7A3525FB78F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsConsolidationItemsAxis" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsAxis_B1FC5EC1300E19F309F77A3525FCAD36" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_6B04674191951CA6077F7A3525FA4A0C" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsAxis_B1FC5EC1300E19F309F77A3525FCAD36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsConsolidationItemsDomain" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_4C582A151D4BD2B4D32A7A3525FC0C8E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_B1FC5EC1300E19F309F77A3525FCAD36" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_4C582A151D4BD2B4D32A7A3525FC0C8E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsConsolidationItemsDomain" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_4C582A151D4BD2B4D32A7A3525FC0C8E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_B1FC5EC1300E19F309F77A3525FCAD36" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_4C582A151D4BD2B4D32A7A3525FC0C8E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/StockholdersEquity" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/StockholdersEquityTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SubsequentEvents" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_1BAE6677BDE678E995B07A3525E35B2B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="loc_us-gaap_SubsequentEventTable_191EEFBD82161E55AC577A3525E27F40" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_1BAE6677BDE678E995B07A3525E35B2B" xlink:to="loc_us-gaap_SubsequentEventTable_191EEFBD82161E55AC577A3525E27F40" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_3BCB301BAB64248B5DE77A3525E23BC4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_191EEFBD82161E55AC577A3525E27F40" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_3BCB301BAB64248B5DE77A3525E23BC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_6279A7AC2629083577197A3525E3EEFF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_3BCB301BAB64248B5DE77A3525E23BC4" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_6279A7AC2629083577197A3525E3EEFF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_6279A7AC2629083577197A3525E3EEFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_3BCB301BAB64248B5DE77A3525E23BC4" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_6279A7AC2629083577197A3525E3EEFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_BDE7E650A5AE5B5641857A3525E39E3E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_6279A7AC2629083577197A3525E3EEFF" xlink:to="loc_us-gaap_SubsequentEventMember_BDE7E650A5AE5B5641857A3525E39E3E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SubsequentEventsDetailsTextual" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_294328FC9DB14A16E866299F3DBA684F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="loc_us-gaap_SubsequentEventTable_29589367DBFA040D002C299F3DB89D39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_294328FC9DB14A16E866299F3DBA684F" xlink:to="loc_us-gaap_SubsequentEventTable_29589367DBFA040D002C299F3DB89D39" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_DFB85EA89B8107CC2461299F3DB9A56E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_29589367DBFA040D002C299F3DB89D39" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_DFB85EA89B8107CC2461299F3DB9A56E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_CB4C89B761F226D1BC7B299F3DB9F912_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_DFB85EA89B8107CC2461299F3DB9A56E" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_CB4C89B761F226D1BC7B299F3DB9F912_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_CB4C89B761F226D1BC7B299F3DB9F912" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_DFB85EA89B8107CC2461299F3DB9A56E" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_CB4C89B761F226D1BC7B299F3DB9F912" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_D0F3A50966C4EBBFFF0C299F3DB9D4F5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_CB4C89B761F226D1BC7B299F3DB9F912" xlink:to="loc_us-gaap_SubsequentEventMember_D0F3A50966C4EBBFFF0C299F3DB9D4F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_947ECF8929B86069D8FE299F3DBA5369" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_294328FC9DB14A16E866299F3DBA684F" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_947ECF8929B86069D8FE299F3DBA5369" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_F949F2CAB9CF46CC8315299F3DBAD65F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_294328FC9DB14A16E866299F3DBA684F" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_F949F2CAB9CF46CC8315299F3DBAD65F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DividendsPayableDateOfRecordDayMonthAndYear" xlink:label="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_81730E326FA4C59D0001299F3DBA3DF5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_294328FC9DB14A16E866299F3DBA684F" xlink:to="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_81730E326FA4C59D0001299F3DBA3DF5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesAccountingChangesAndErrorCorrectionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_89E4AA67A2F1BD1FE1427A3526529516" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_89E4AA67A2F1BD1FE1427A3526529516" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_0898BB2B6324A7399D6A7A3526532C0F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_89E4AA67A2F1BD1FE1427A3526529516" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_0898BB2B6324A7399D6A7A3526532C0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_0898BB2B6324A7399D6A7A3526532C0F" xlink:to="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_0898BB2B6324A7399D6A7A3526532C0F" xlink:to="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScenarioPreviouslyReportedMember" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_0414DEF40B8BBBAA13CC7A3526533F24" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_0414DEF40B8BBBAA13CC7A3526533F24" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementAdjustmentMember" xlink:label="loc_srt_RestatementAdjustmentMember_882372D2EC641A6B3C1E7A352653F0FE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722" xlink:to="loc_srt_RestatementAdjustmentMember_882372D2EC641A6B3C1E7A352653F0FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_C328B4339FC25EBE82A87A352654A9CF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_87A1C645C0BFE75312E77A3526538722" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_C328B4339FC25EBE82A87A352654A9CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis" xlink:label="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_A309477F51D8BD3391CF7A352654BF5D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_89E4AA67A2F1BD1FE1427A3526529516" xlink:to="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_A309477F51D8BD3391CF7A352654BF5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ChangeInAccountingPrincipleMember" xlink:label="loc_us-gaap_ChangeInAccountingPrincipleMember_3750C09B6B4CC553C2547A35265437E1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_A309477F51D8BD3391CF7A352654BF5D" xlink:to="loc_us-gaap_ChangeInAccountingPrincipleMember_3750C09B6B4CC553C2547A35265437E1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ChangeInAccountingPrincipleMember" xlink:label="loc_us-gaap_ChangeInAccountingPrincipleMember_3750C09B6B4CC553C2547A35265437E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_A309477F51D8BD3391CF7A352654BF5D" xlink:to="loc_us-gaap_ChangeInAccountingPrincipleMember_3750C09B6B4CC553C2547A35265437E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_3BCFC8A5EB1BCA4795467A3526544872" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_89E4AA67A2F1BD1FE1427A3526529516" xlink:to="loc_us-gaap_StatementScenarioAxis_3BCFC8A5EB1BCA4795467A3526544872" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8CFB401A28DDA85B668B7A352654CF1B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_3BCFC8A5EB1BCA4795467A3526544872" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8CFB401A28DDA85B668B7A352654CF1B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8CFB401A28DDA85B668B7A352654CF1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_3BCFC8A5EB1BCA4795467A3526544872" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8CFB401A28DDA85B668B7A352654CF1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_336EB95E0FEE67953F727A35265583F7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_336EB95E0FEE67953F727A35265583F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_B2740D3449537AA79E547A352655AD7D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_B2740D3449537AA79E547A352655AD7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_0EDDB7874E899EC25D6F7A35265536C7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_0EDDB7874E899EC25D6F7A35265536C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRentCreditNoncurrent" xlink:label="loc_us-gaap_DeferredRentCreditNoncurrent_6AF853CC013734FE495D7A3526559A5E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:to="loc_us-gaap_DeferredRentCreditNoncurrent_6AF853CC013734FE495D7A3526559A5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification" xlink:label="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification_8672D14C4FAAA2E83F4B7A352656E1C6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_8CCE57CF019B25678B767A35265575AD" xlink:to="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification_8672D14C4FAAA2E83F4B7A352656E1C6" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C2BF2C13A7DA920FA1FC7A3525E88DD5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_31D76244F08F56C78F567A3525E65293" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C2BF2C13A7DA920FA1FC7A3525E88DD5" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_31D76244F08F56C78F567A3525E65293" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_4FDAEE78BC5C095C4C597A3525E6D1E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_31D76244F08F56C78F567A3525E65293" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_4FDAEE78BC5C095C4C597A3525E6D1E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_9F127BE76F9BA88B092F7A3525E6969B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_4FDAEE78BC5C095C4C597A3525E6D1E1" xlink:to="loc_us-gaap_TypeOfAdoptionMember_9F127BE76F9BA88B092F7A3525E6969B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_9F127BE76F9BA88B092F7A3525E6969B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_4FDAEE78BC5C095C4C597A3525E6D1E1" xlink:to="loc_us-gaap_TypeOfAdoptionMember_9F127BE76F9BA88B092F7A3525E6969B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis" xlink:label="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_CD71B18F9407FA5865F87A3525E79F34" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_31D76244F08F56C78F567A3525E65293" xlink:to="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_CD71B18F9407FA5865F87A3525E79F34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ChangeInAccountingPrincipleMember" xlink:label="loc_us-gaap_ChangeInAccountingPrincipleMember_849EC00BB89C8312E1957A3525E7570D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_CD71B18F9407FA5865F87A3525E79F34" xlink:to="loc_us-gaap_ChangeInAccountingPrincipleMember_849EC00BB89C8312E1957A3525E7570D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ChangeInAccountingPrincipleMember" xlink:label="loc_us-gaap_ChangeInAccountingPrincipleMember_849EC00BB89C8312E1957A3525E7570D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis_CD71B18F9407FA5865F87A3525E79F34" xlink:to="loc_us-gaap_ChangeInAccountingPrincipleMember_849EC00BB89C8312E1957A3525E7570D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_2EDDF0CD906E826CA1497A3525E701D6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_31D76244F08F56C78F567A3525E65293" xlink:to="loc_srt_RestatementAxis_2EDDF0CD906E826CA1497A3525E701D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_E39BC06F1AE8B197C0DC7A3525E71CDE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_2EDDF0CD906E826CA1497A3525E701D6" xlink:to="loc_srt_RestatementDomain_E39BC06F1AE8B197C0DC7A3525E71CDE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_E39BC06F1AE8B197C0DC7A3525E71CDE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_2EDDF0CD906E826CA1497A3525E701D6" xlink:to="loc_srt_RestatementDomain_E39BC06F1AE8B197C0DC7A3525E71CDE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="loc_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_0708DCD55E36C4A493E87A3525E8CC08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C2BF2C13A7DA920FA1FC7A3525E88DD5" xlink:to="loc_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_0708DCD55E36C4A493E87A3525E8CC08" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/TemplateLink" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VariableInterestEntities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityLineItems" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_AF1CE918C6A0CA9B0A1A7A3525A46850" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_FB694017CA7994B05B4D7A35259E9DE4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_AF1CE918C6A0CA9B0A1A7A3525A46850" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_FB694017CA7994B05B4D7A35259E9DE4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6C251BE0F9392E2E1BF97A35259F33A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_FB694017CA7994B05B4D7A35259E9DE4" xlink:to="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6C251BE0F9392E2E1BF97A35259F33A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6C251BE0F9392E2E1BF97A35259F33A7" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_6C251BE0F9392E2E1BF97A35259F33A7" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_WestwoodFundsMember" xlink:label="loc_whg_WestwoodFundsMember_FA58FF0F87ABD71E16AD7A3525A06C16" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_WestwoodFundsMember_FA58FF0F87ABD71E16AD7A3525A06C16" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_CommonTrustFundsMember" xlink:label="loc_whg_CommonTrustFundsMember_596E69538679E5DABE727A3525A3E1A4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_CommonTrustFundsMember_596E69538679E5DABE727A3525A3E1A4" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_4E2B76B6B40097B2D3B27A3525A35347" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_4E2B76B6B40097B2D3B27A3525A35347" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_WestwoodHospitalityFundILLCMember" xlink:label="loc_whg_WestwoodHospitalityFundILLCMember_51741855884795CA64267A3525A3E51C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_WestwoodHospitalityFundILLCMember_51741855884795CA64267A3525A3E51C" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PrivateEquityInvestmentsMember" xlink:label="loc_whg_PrivateEquityInvestmentsMember_2A12B609202A1C6A29307A3525A38883" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_PrivateEquityInvestmentsMember_2A12B609202A1C6A29307A3525A38883" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_PrivateWealthMember" xlink:label="loc_whg_PrivateWealthMember_1B3DE643FD32EA3DFE747A3525A4B730" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_PrivateWealthMember_1B3DE643FD32EA3DFE747A3525A4B730" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_InstitutionalMember" xlink:label="loc_whg_InstitutionalMember_DEECD8C936CF5B423EB67A3525A40B41" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_0BA427D9E7730FD5FD817A35259FB928" xlink:to="loc_whg_InstitutionalMember_DEECD8C936CF5B423EB67A3525A40B41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_1DC013DCFF592753A36D7A3525A4DAC6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_AF1CE918C6A0CA9B0A1A7A3525A46850" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_1DC013DCFF592753A36D7A3525A4DAC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsUnderManagementCarryingAmount" xlink:label="loc_us-gaap_AssetsUnderManagementCarryingAmount_1F3BDF1B10A2D29047247A3525A55809" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_1DC013DCFF592753A36D7A3525A4DAC6" xlink:to="loc_us-gaap_AssetsUnderManagementCarryingAmount_1F3BDF1B10A2D29047247A3525A55809" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecurities" xlink:label="loc_us-gaap_TradingSecurities_A497C217B176381A42717A3525A5239E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_1DC013DCFF592753A36D7A3525A4DAC6" xlink:to="loc_us-gaap_TradingSecurities_A497C217B176381A42717A3525A5239E" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_RiskOfLoss" xlink:label="loc_whg_RiskOfLoss_3757769952F7C0F2985A7A3525A560A5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesAbstract_1DC013DCFF592753A36D7A3525A4DAC6" xlink:to="loc_whg_RiskOfLoss_3757769952F7C0F2985A7A3525A560A5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VariableInterestEntitiesDetailsTextual" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityLineItems" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_CBF8CBAC02E9E0A07ED04861BC981CAF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_96E7AD37F34A8440F82C4861BC9783F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CBF8CBAC02E9E0A07ED04861BC981CAF" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_96E7AD37F34A8440F82C4861BC9783F2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_0901213CADB4EA314EB34861BC973FEE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_96E7AD37F34A8440F82C4861BC9783F2" xlink:to="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_0901213CADB4EA314EB34861BC973FEE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_0901213CADB4EA314EB34861BC973FEE" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_0901213CADB4EA314EB34861BC973FEE" xlink:to="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_VariableInterestEntityMember" xlink:label="loc_whg_VariableInterestEntityMember_B98741D39FA389BF3D414861BC9796CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4" xlink:to="loc_whg_VariableInterestEntityMember_B98741D39FA389BF3D414861BC9796CD" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_CommonTrustFundsMember" xlink:label="loc_whg_CommonTrustFundsMember_9898EB0408CCBCED01B84861BC980900" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4" xlink:to="loc_whg_CommonTrustFundsMember_9898EB0408CCBCED01B84861BC980900" xlink:type="arc" />
    <link:loc xlink:href="whg-20190630.xsd#whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember" xlink:label="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_B136107B23D55A57DF234861BC98C0C2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_1F6EF1925446A746D89F4861BC97A0B4" xlink:to="loc_whg_UndertakingForCollectiveInvestmentInTransferableSecuritiesMember_B136107B23D55A57DF234861BC98C0C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TradingSecurities" xlink:label="loc_us-gaap_TradingSecurities_0A7039285E39C7F12CD74861BC98D693" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CBF8CBAC02E9E0A07ED04861BC981CAF" xlink:to="loc_us-gaap_TradingSecurities_0A7039285E39C7F12CD74861BC98D693" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues" xlink:label="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_07C967E7101E9A3691404861BC99B1E3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_CBF8CBAC02E9E0A07ED04861BC981CAF" xlink:to="loc_us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues_07C967E7101E9A3691404861BC99B1E3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VariableInterestEntitiesPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://westwoodgroup.com/role/VariableInterestEntitiesTables" xlink:type="extended" />
</link:linkbase>





