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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourAndFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourAndFiveYears_190A1E4B529FC7FF96EFC5D74228921D" 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_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_B2031AF833FE5FE6E080C5D74228B234" xlink:type="locator" />
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    <link:label id="lab_dlhc_LongTermDebtandOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityAbstract_3C4179D9724D17EED732C5D74228342D_label_en-US" xlink:label="lab_dlhc_LongTermDebtandOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityAbstract_3C4179D9724D17EED732C5D74228342D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long Term Debt and Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]</link:label>
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    <link:loc xlink:href="dlhc-20181231.xsd#dlhc_LongTermDebtandOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityAbstract" xlink:label="loc_dlhc_LongTermDebtandOperatingLeasesFutureMinimumPaymentsDueFiscalYearMaturityAbstract_3C4179D9724D17EED732C5D74228342D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ContractualObligationDueInNextTwelveMonths_AA498B8600363625D82CC5D74229061E_terseLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInNextTwelveMonths_AA498B8600363625D82CC5D74229061E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Next 12 Months</link:label>
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    <link:label id="lab_dlhc_DLHEmployeesMember_84A60C9735FB4F08C2E6C5D7425D12BA_terseLabel_en-US" xlink:label="lab_dlhc_DLHEmployeesMember_84A60C9735FB4F08C2E6C5D7425D12BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DLH employees</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_53C71AEA2D26B6069125A61B4090628B_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_53C71AEA2D26B6069125A61B4090628B" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the beginning of the period (in dollars)</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_CF112F6B27BA034A83CC91717B08AE6B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_9C7FB6387F695D73803AB9922CA6B836" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Credit Facilities</link:label>
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    <link:label id="lab_us-gaap_StandbyLettersOfCreditMember_A0693428F7F7A45EBAC5A61B41089497_terseLabel_en-US" xlink:label="lab_us-gaap_StandbyLettersOfCreditMember_A0693428F7F7A45EBAC5A61B41089497" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letter of Credit</link:label>
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    <link:loc xlink:href="dlhc-20181231.xsd#dlhc_DebtCovenantDomain" xlink:label="loc_dlhc_DebtCovenantDomain_2D0350909A4D10CD14CEA61B4108C823" xlink:type="locator" />
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    <link:label id="lab_dlhc_DebtInstrumentPaymentTermsNumberofEqualPayments_4782EB26902B984F085DA6315B104367_terseLabel_en-US" xlink:label="lab_dlhc_DebtInstrumentPaymentTermsNumberofEqualPayments_4782EB26902B984F085DA6315B104367" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of equal installment payments</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_47801F86636CB9E264F9A6315B60D83F_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_47801F86636CB9E264F9A6315B60D83F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Monthly installment payments</link:label>
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    <link:label id="lab_dlhc_FixedChargeCoverageRatio_D79C6B45E22D1C057A9EA61B41093934_terseLabel_en-US" xlink:label="lab_dlhc_FixedChargeCoverageRatio_D79C6B45E22D1C057A9EA61B41093934" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed charge coverage ratio</link:label>
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    <link:label id="lab_dlhc_RatioofDebttoEarningsBeforeInterestTaxesDepreciationsandAmortization_E7D541B08EE5EC33A8EAA61B41098725_terseLabel_en-US" xlink:label="lab_dlhc_RatioofDebttoEarningsBeforeInterestTaxesDepreciationsandAmortization_E7D541B08EE5EC33A8EAA61B41098725" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ratio of debt to EBITDA at closing at thereafter</link:label>
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