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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6D143690ECEC407E4E5786CBD27D1B71" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentDomain_EEDAAF659E585B0696F186CBD27D4D04_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_EEDAAF659E585B0696F186CBD27D4D04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
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    <link:loc xlink:href="asgn-20160331.xsd#asgn_ApexSegmentMember" xlink:label="loc_asgn_ApexSegmentMember_E9406BFD53192289978286CBD27D541E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_A777735413302233FBD27B64B7662758_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_A777735413302233FBD27B64B7662758" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_C7A42689F9502F0BD6C77B64B7664D9E_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_C7A42689F9502F0BD6C77B64B7664D9E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
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    <link:label id="lab_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_377D82CCA46417385FC177E930014EF5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_377D82CCA46417385FC177E930014EF5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Gain on sale of discontinued operations, net of income taxes</link:label>
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    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_A1FB9408E0548E215FEB77E93001221B_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_A1FB9408E0548E215FEB77E93001221B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_A1FB9408E0548E215FEB77E93001221B_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_A1FB9408E0548E215FEB77E93001221B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Depletion and Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_A1FB9408E0548E215FEB77E93001221B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensation_29641EDF142774B3795F77E93001F9BF_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_29641EDF142774B3795F77E93001F9BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
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    <link:label id="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_6D5E8A12424DA6D18C6B77E93006C99B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_6D5E8A12424DA6D18C6B77E93006C99B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Gross excess tax benefits from stock-based compensation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_6D5E8A12424DA6D18C6B77E93006C99B" xlink:type="locator" />
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    <link:label id="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_2549990690B683E5439477E9300656A5_negatedTerseLabel_en-US" xlink:label="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_2549990690B683E5439477E9300656A5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Workers&#8217; compensation provision</link:label>
    <link:label id="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_2549990690B683E5439477E9300656A5_label_en-US" xlink:label="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_2549990690B683E5439477E9300656A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Workers&#8217; compensation and medical malpractice provision</link:label>
    <link:label id="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_2549990690B683E5439477E9300656A5_documentation_en-US" xlink:label="lab_asgn_WorkersCompensationAndMedicalMalpracticeProvision_2549990690B683E5439477E9300656A5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net change of the provision for obligations and payables pertaining to claims incurred of a workers compensation and medical malpractice provision.</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncome_052AED089FD5FD303E6E77E930062D3B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncome_052AED089FD5FD303E6E77E930062D3B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherNoncashIncome_052AED089FD5FD303E6E77E930062D3B_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncome_052AED089FD5FD303E6E77E930062D3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AF8AA4DB0332DAA4FE6877E93006BB96" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_C6195B93FD1C10939B2377E93006D1E6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_C6195B93FD1C10939B2377E93006D1E6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable</link:label>
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    <link:label id="lab_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A_terseLabel_en-US" xlink:label="lab_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award [Axis]</link:label>
    <link:label id="lab_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A_label_en-US" xlink:label="lab_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award [Axis]</link:label>
    <link:label id="lab_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A_documentation_en-US" xlink:label="lab_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Award [Axis]</link:label>
    <link:loc xlink:href="asgn-20160331.xsd#asgn_AwardAxis" xlink:label="loc_asgn_AwardAxis_15B480D5D0145000EB9F77E92E3CD51A" xlink:type="locator" />
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    <link:label id="lab_asgn_AwardDomain_78C39D7EF7503DE407A377E92E3C28B9_terseLabel_en-US" xlink:label="lab_asgn_AwardDomain_78C39D7EF7503DE407A377E92E3C28B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award [Domain]</link:label>
    <link:label id="lab_asgn_AwardDomain_78C39D7EF7503DE407A377E92E3C28B9_label_en-US" xlink:label="lab_asgn_AwardDomain_78C39D7EF7503DE407A377E92E3C28B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award [Domain]</link:label>
    <link:label id="lab_asgn_AwardDomain_78C39D7EF7503DE407A377E92E3C28B9_documentation_en-US" xlink:label="lab_asgn_AwardDomain_78C39D7EF7503DE407A377E92E3C28B9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Award [Axis]</link:label>
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    <link:label id="lab_asgn_AwardInstrumentAxis_5FEADFC8264AC409536677E92E3C22FC_label_en-US" xlink:label="lab_asgn_AwardInstrumentAxis_5FEADFC8264AC409536677E92E3C22FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Instrument [Axis]</link:label>
    <link:label id="lab_asgn_AwardInstrumentAxis_5FEADFC8264AC409536677E92E3C22FC_documentation_en-US" xlink:label="lab_asgn_AwardInstrumentAxis_5FEADFC8264AC409536677E92E3C22FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Award Instrument [Axis]</link:label>
    <link:loc xlink:href="asgn-20160331.xsd#asgn_AwardInstrumentAxis" xlink:label="loc_asgn_AwardInstrumentAxis_5FEADFC8264AC409536677E92E3C22FC" xlink:type="locator" />
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    <link:label id="lab_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15_terseLabel_en-US" xlink:label="lab_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Instrument [Domain]</link:label>
    <link:label id="lab_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15_label_en-US" xlink:label="lab_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Instrument [Domain]</link:label>
    <link:label id="lab_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15_documentation_en-US" xlink:label="lab_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Award Instrument [Domain]</link:label>
    <link:loc xlink:href="asgn-20160331.xsd#asgn_AwardInstrumentDomain" xlink:label="loc_asgn_AwardInstrumentDomain_181BD6C20CF31EFABD7E77E92E3C5E15" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TitleOfIndividualAxis_98E91B40F1A590D04BAC77E92E3CF583_label_en-US" xlink:label="lab_us-gaap_TitleOfIndividualAxis_98E91B40F1A590D04BAC77E92E3CF583" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of Individual [Axis]</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_TitleOfIndividualAxis_98E91B40F1A590D04BAC77E92E3CF583" xlink:to="lab_us-gaap_TitleOfIndividualAxis_98E91B40F1A590D04BAC77E92E3CF583" xlink:type="arc" />
    <link:label id="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_E1E9E5966E66AFFDEDBB77E92E3CF4D9_terseLabel_en-US" xlink:label="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_E1E9E5966E66AFFDEDBB77E92E3CF4D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title of Individual with Relationship to Entity</link:label>
    <link:label id="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_E1E9E5966E66AFFDEDBB77E92E3CF4D9_label_en-US" xlink:label="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_E1E9E5966E66AFFDEDBB77E92E3CF4D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Relationship to Entity [Domain]</link:label>
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    <link:label id="lab_us-gaap_AwardTypeAxis_A0DD16DD5058E71DE6CE77E92E3CC887_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_A0DD16DD5058E71DE6CE77E92E3CC887" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Type</link:label>
    <link:label id="lab_us-gaap_AwardTypeAxis_A0DD16DD5058E71DE6CE77E92E3CC887_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_A0DD16DD5058E71DE6CE77E92E3CC887" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
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    <link:label id="lab_asgn_EmployeeStockPurchasePlanMember_61C681F252AF15C229C477E92E3CDB0A_terseLabel_en-US" xlink:label="lab_asgn_EmployeeStockPurchasePlanMember_61C681F252AF15C229C477E92E3CDB0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2010 Employee Stock Purchase Plan (ESPP)</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_E688FE196190A0EEC06877E92E3C6F3D_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_E688FE196190A0EEC06877E92E3C6F3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee stock purchase plan shares issued during period</link:label>
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