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    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_1AED9B87F8CB39BC3BEB5055511BFA18_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_1AED9B87F8CB39BC3BEB5055511BFA18" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Value of shares withheld related to employee tax withholding</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5FEE5AC445B06E193F065055511C91C7_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5FEE5AC445B06E193F065055511C91C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_BB90390767DA61DE8AF85055511C1FD4_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_BB90390767DA61DE8AF85055511C1FD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CASH(a)</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_BB90390767DA61DE8AF85055511C1FD4_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValueAbstract_BB90390767DA61DE8AF85055511C1FD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_A5F9A9A6C4FE8D9ACC5F5065D59FE9E4_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_A5F9A9A6C4FE8D9ACC5F5065D59FE9E4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net change during the period</link:label>
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_713B3E886AF423C0556E5055511D5E1C_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_713B3E886AF423C0556E5055511D5E1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental cash flow information:</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaid_EB419EAA57DB86933F5B5055511DB6F6_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_EB419EAA57DB86933F5B5055511DB6F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes paid</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_B6DF9339D703F4F0F84C5055511E8E20_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_B6DF9339D703F4F0F84C5055511E8E20" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock issued as incentive compensation</link:label>
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    <link:label id="lab_dhil_ContributionofInvestmentsandPropertyandEquipment_319C0EFDF0AFAAB1D4345055511EC0AE_terseLabel_en-US" xlink:label="lab_dhil_ContributionofInvestmentsandPropertyandEquipment_319C0EFDF0AFAAB1D4345055511EC0AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Charitable donation of corporate investments</link:label>
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    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_FBF86C24197BB7BCD2304F751F363ABD_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_FBF86C24197BB7BCD2304F751F363ABD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer, Excluding Assessed Tax</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent_39BA6ADA61ACB50B764A4A4B62AA5C8B_label_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent_39BA6ADA61ACB50B764A4A4B62AA5C8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Current</link:label>
    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent_39BA6ADA61ACB50B764A4A4B62AA5C8B_documentation_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent_39BA6ADA61ACB50B764A4A4B62AA5C8B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee service share based compensation nonvested awards compensation cost not yet recognized current.</link:label>
    <link:loc xlink:href="dhil-20190331.xsd#dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent" xlink:label="loc_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedCurrent_39BA6ADA61ACB50B764A4A4B62AA5C8B" xlink:type="locator" />
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearOne_086822A71A11C1A16EF24A4B62AA32CC_terseLabel_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearOne_086822A71A11C1A16EF24A4B62AA32CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearOne_086822A71A11C1A16EF24A4B62AA32CC_documentation_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearOne_086822A71A11C1A16EF24A4B62AA32CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee service share based compensation nonvested awards compensation cost not yet recognized in year one.</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo_7B8ED34FDB27B9D672DE4A4B62AB43E7_terseLabel_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo_7B8ED34FDB27B9D672DE4A4B62AB43E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo_7B8ED34FDB27B9D672DE4A4B62AB43E7_documentation_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo_7B8ED34FDB27B9D672DE4A4B62AB43E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee service share based compensation nonvested awards compensation cost not yet recognized in year two.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo_7B8ED34FDB27B9D672DE4A4B62AB43E7" xlink:to="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearTwo_7B8ED34FDB27B9D672DE4A4B62AB43E7" xlink:type="arc" />
    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81_terseLabel_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81_documentation_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee service share based compensation nonvested awards compensation cost not yet recognized in year three.</link:label>
    <link:loc xlink:href="dhil-20190331.xsd#dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree" xlink:label="loc_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81" xlink:to="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearThree_8C1877BAC8BA920EC0904A4B62AB5F81" xlink:type="arc" />
    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFour_49ABE02470896EC254824A4B62AB3E5F_terseLabel_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFour_49ABE02470896EC254824A4B62AB3E5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFour_49ABE02470896EC254824A4B62AB3E5F_documentation_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFour_49ABE02470896EC254824A4B62AB3E5F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee service share based compensation nonvested awards compensation cost not yet recognized in year four</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFive_AB05B9A0D841D76493204A4B62ABB972_terseLabel_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFive_AB05B9A0D841D76493204A4B62ABB972" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
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    <link:label id="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFive_AB05B9A0D841D76493204A4B62ABB972_documentation_en-US" xlink:label="lab_dhil_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedInYearFive_AB05B9A0D841D76493204A4B62ABB972" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee service share based compensation nonvested awards compensation cost not yet recognized in year five.</link:label>
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    <link:label id="lab_dhil_AssetUnderManagementContractualPeriodEndTotalMember_09CD2ADD94EA015F1FEC45C7FE48CE84_terseLabel_en-US" xlink:label="lab_dhil_AssetUnderManagementContractualPeriodEndTotalMember_09CD2ADD94EA015F1FEC45C7FE48CE84" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
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    <link:label id="lab_dhil_AssetUnderManagementContractualPeriodEndTotalMember_09CD2ADD94EA015F1FEC45C7FE48CE84_documentation_en-US" xlink:label="lab_dhil_AssetUnderManagementContractualPeriodEndTotalMember_09CD2ADD94EA015F1FEC45C7FE48CE84" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Under Management Contractual Period End Total</link:label>
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    <link:label id="lab_us-gaap_PrincipleTransactionRevenueLineItems_E30B261137D32324700C45C7FE4975EC_terseLabel_en-US" xlink:label="lab_us-gaap_PrincipleTransactionRevenueLineItems_E30B261137D32324700C45C7FE4975EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal Transaction Revenue [Line Items]</link:label>
    <link:label id="lab_us-gaap_PrincipleTransactionRevenueLineItems_E30B261137D32324700C45C7FE4975EC_label_en-US" xlink:label="lab_us-gaap_PrincipleTransactionRevenueLineItems_E30B261137D32324700C45C7FE4975EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Principal Transaction Revenue [Line Items]</link:label>
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    <link:label id="lab_dhil_AssetsUnderManagementVariableRateFees_1CD4BCE16999354D35F445C7FE49B071_terseLabel_en-US" xlink:label="lab_dhil_AssetsUnderManagementVariableRateFees_1CD4BCE16999354D35F445C7FE49B071" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">AUM subject to variable rate fees</link:label>
    <link:label id="lab_dhil_AssetsUnderManagementVariableRateFees_1CD4BCE16999354D35F445C7FE49B071_label_en-US" xlink:label="lab_dhil_AssetsUnderManagementVariableRateFees_1CD4BCE16999354D35F445C7FE49B071" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Under Management Variable Rate Fees</link:label>
    <link:label id="lab_dhil_AssetsUnderManagementVariableRateFees_1CD4BCE16999354D35F445C7FE49B071_documentation_en-US" xlink:label="lab_dhil_AssetsUnderManagementVariableRateFees_1CD4BCE16999354D35F445C7FE49B071" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Assets under management (AUM) subject to variable rate fees and variable rate fees.</link:label>
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    <link:label id="lab_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC_terseLabel_en-US" xlink:label="lab_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unearned variable rate fees</link:label>
    <link:label id="lab_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC_label_en-US" xlink:label="lab_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Potential Variable Fees Based Upon Current Investment Results</link:label>
    <link:label id="lab_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC_documentation_en-US" xlink:label="lab_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Potential Variable Fees Based Upon Current Investment Results</link:label>
    <link:loc xlink:href="dhil-20190331.xsd#dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults" xlink:label="loc_dhil_PotentialVariableFeesBasedUponCurrentInvestmentResults_85E77CC18DFB14D6AF7E45C7FE49CBCC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remainder of 2019</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8570B9B01F034F2C0F1050833F6CCA53" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4_verboseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0932ED2B7C28CCDEFD995083D9F74EE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_007AA50B975A98CBF9CC508413A60BFC" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_3B49882C683396EB0BB050845CF50159" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_706757163C38183FA2B950848C9C1DF4" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_05711259DC4AFC7174355085A514CE5D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_A5C07D4E9B3168DECF365085F4C3A453_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_A5C07D4E9B3168DECF365085F4C3A453" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total future lease payments due</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_A5C07D4E9B3168DECF365085F4C3A453_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_A5C07D4E9B3168DECF365085F4C3A453" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_A5C07D4E9B3168DECF365085F4C3A453" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_E60EA4CEDE13D2B1D6E56A089CD07A03" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_CF99A2169A3DC5FADAEF6A089CD19B8E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_CF99A2169A3DC5FADAEF6A089CD19B8E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Forfeiture of restricted stock grants</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_CF99A2169A3DC5FADAEF6A089CD19B8E_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_CF99A2169A3DC5FADAEF6A089CD19B8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Restricted Stock Award, Forfeitures</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_CF99A2169A3DC5FADAEF6A089CD19B8E" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_CF99A2169A3DC5FADAEF6A089CD19B8E" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_C0A7069537D0E740FE7B6A089CD1A382_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_C0A7069537D0E740FE7B6A089CD1A382" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repurchase of common stock (shares)</link:label>
    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_C0A7069537D0E740FE7B6A089CD1A382_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_C0A7069537D0E740FE7B6A089CD1A382" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchased and Retired During Period, Shares</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_C0A7069537D0E740FE7B6A089CD1A382" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_8455C1207CADE4F272276A089CD15CF7_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_8455C1207CADE4F272276A089CD15CF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchased and Retired During Period, Value</link:label>
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    <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_B5A37BDB62DEE0CEFDF76A089CD13C3E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_EE836CD23156698527E16A089CD1571C_periodEndLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_EE836CD23156698527E16A089CD1571C" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Ending balance (shares)</link:label>
    <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_EE836CD23156698527E16A089CD1571C" xlink:type="locator" />
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    <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_FB5069AEDB9DB5F5B65A6A089CD1E1B0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_7352D4B47A26BB40DA156A089CD2FC34_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_7352D4B47A26BB40DA156A089CD2FC34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Temporary Equity [Roll Forward]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_7352D4B47A26BB40DA156A089CD2FC34" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_65D5E06C793245D5F6A36A089CD24B00_label_en-US" xlink:label="lab_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_65D5E06C793245D5F6A36A089CD24B00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Redeemable Noncontrolling Interest, Equity, Carrying Amount</link:label>
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    <link:label id="lab_dhil_SubscriptionFromRedemptionDistributionToNoncontrollingInterest_83C45CCE7FF1193176C36A089CD22FE1_terseLabel_en-US" xlink:label="lab_dhil_SubscriptionFromRedemptionDistributionToNoncontrollingInterest_83C45CCE7FF1193176C36A089CD22FE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net subscriptions of consolidated funds</link:label>
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