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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_6A4C5EF9D42F2FFB76AB19B5A366C34F_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_6A4C5EF9D42F2FFB76AB19B5A366C34F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Face amount of term loan</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_6A4C5EF9D42F2FFB76AB19B5A366C34F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_6A4C5EF9D42F2FFB76AB19B5A366C34F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9EE162BD72FA6B05881019B5A366C746_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9EE162BD72FA6B05881019B5A366C746" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basis spread on variable rate borrowings</link:label>
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    <link:label id="lab_us-gaap_DebtWeightedAverageInterestRate_C339BA7B5C4D4718A80219B5A366095C_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtWeightedAverageInterestRate_C339BA7B5C4D4718A80219B5A366095C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate</link:label>
    <link:label id="lab_us-gaap_DebtWeightedAverageInterestRate_C339BA7B5C4D4718A80219B5A366095C_label_en-US" xlink:label="lab_us-gaap_DebtWeightedAverageInterestRate_C339BA7B5C4D4718A80219B5A366095C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt, Weighted Average Interest Rate</link:label>
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    <link:label id="lab_asgn_ContractualQuarterlyPayments_EF354A88EFE33D41631C19C52257DDE0_label_en-US" xlink:label="lab_asgn_ContractualQuarterlyPayments_EF354A88EFE33D41631C19C52257DDE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contractual Quarterly Payments</link:label>
    <link:label id="lab_asgn_ContractualQuarterlyPayments_EF354A88EFE33D41631C19C52257DDE0_documentation_en-US" xlink:label="lab_asgn_ContractualQuarterlyPayments_EF354A88EFE33D41631C19C52257DDE0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contractual Quarterly Payments</link:label>
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    <link:label id="lab_asgn_PaymentsonDebt_CA299F6DB79071CAF40119C54C533CD3_terseLabel_en-US" xlink:label="lab_asgn_PaymentsonDebt_CA299F6DB79071CAF40119C54C533CD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments on Debt</link:label>
    <link:label id="lab_asgn_PaymentsonDebt_CA299F6DB79071CAF40119C54C533CD3_label_en-US" xlink:label="lab_asgn_PaymentsonDebt_CA299F6DB79071CAF40119C54C533CD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments on Debt</link:label>
    <link:label id="lab_asgn_PaymentsonDebt_CA299F6DB79071CAF40119C54C533CD3_documentation_en-US" xlink:label="lab_asgn_PaymentsonDebt_CA299F6DB79071CAF40119C54C533CD3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments on Debt</link:label>
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    <link:label id="lab_asgn_LeverageRatio_B0655667F065EBF3426919B5A366C375_label_en-US" xlink:label="lab_asgn_LeverageRatio_B0655667F065EBF3426919B5A366C375" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leverage Ratio</link:label>
    <link:label id="lab_asgn_LeverageRatio_B0655667F065EBF3426919B5A366C375_documentation_en-US" xlink:label="lab_asgn_LeverageRatio_B0655667F065EBF3426919B5A366C375" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The leverage ratio as defined in the credit agreement.</link:label>
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    <link:label id="lab_asgn_LeverageRatioinLatestYearofDebtTerm_A9C7B9ECC4783FF3CFF619B5A366ECFE_terseLabel_en-US" xlink:label="lab_asgn_LeverageRatioinLatestYearofDebtTerm_A9C7B9ECC4783FF3CFF619B5A366ECFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leverage Ratio in Latest Year of Debt Term</link:label>
    <link:label id="lab_asgn_LeverageRatioinLatestYearofDebtTerm_A9C7B9ECC4783FF3CFF619B5A366ECFE_label_en-US" xlink:label="lab_asgn_LeverageRatioinLatestYearofDebtTerm_A9C7B9ECC4783FF3CFF619B5A366ECFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leverage Ratio in Latest Year of Debt Term</link:label>
    <link:label id="lab_asgn_LeverageRatioinLatestYearofDebtTerm_A9C7B9ECC4783FF3CFF619B5A366ECFE_documentation_en-US" xlink:label="lab_asgn_LeverageRatioinLatestYearofDebtTerm_A9C7B9ECC4783FF3CFF619B5A366ECFE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Leverage ratio limit in latest year of debt facility, as described in debt agreement.</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FE048A2792A34DA5C41019C79F27F908_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_FE048A2792A34DA5C41019C79F27F908" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15C338021DB9E39C803B19E81AEDE137_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_15C338021DB9E39C803B19E81AEDE137" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition</link:label>
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    <link:label id="lab_asgn_ApexSystemsMember_9810ACCDA6AC4B5FE4C219E81AED5C9C_terseLabel_en-US" xlink:label="lab_asgn_ApexSystemsMember_9810ACCDA6AC4B5FE4C219E81AED5C9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Apex Systems</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_582FA01E9A7E3EC9A8E819E81AED6CDF_verboseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_582FA01E9A7E3EC9A8E819E81AED6CDF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Commitment and contingencies [Line Items]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_582FA01E9A7E3EC9A8E819E81AED6CDF_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_582FA01E9A7E3EC9A8E819E81AED6CDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_218DC9B76D1B8C04A33619E81AEE9ABD_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_218DC9B76D1B8C04A33619E81AEE9ABD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</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_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_218DC9B76D1B8C04A33619E81AEE9ABD" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_81EFA561FE9A98A1220719E81AEE5772" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_81EFA561FE9A98A1220719E81AEE5772" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_81EFA561FE9A98A1220719E81AEE5772" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_0BBDACDA62C16C6E494719E81AEE5466" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_0BBDACDA62C16C6E494719E81AEE5466" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_0BBDACDA62C16C6E494719E81AEE5466" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_2D34B4091A0CB971EB8E19E81AEE62F1_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_2D34B4091A0CB971EB8E19E81AEE62F1" 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_us-gaap_OtherCommitment_D73302E5D7D96BC0F48119E81AEE081F_label_en-US" xlink:label="lab_us-gaap_OtherCommitment_D73302E5D7D96BC0F48119E81AEE081F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitment</link:label>
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    <link:label id="lab_us-gaap_ContractualObligationFiscalYearMaturityAbstract_988B3C222B68EF4B221419E81AEF80DE_label_en-US" xlink:label="lab_us-gaap_ContractualObligationFiscalYearMaturityAbstract_988B3C222B68EF4B221419E81AEF80DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contractual Obligation, Fiscal Year Maturity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ContractualObligationDueInNextTwelveMonths_27CC806410AADFB3981319E81AEFDBB6_totalLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInNextTwelveMonths_27CC806410AADFB3981319E81AEFDBB6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2016</link:label>
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    <link:label id="lab_us-gaap_ContractualObligationDueInThirdYear_AE56ABD1869460409FEC19E81AEFB00D_totalLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInThirdYear_AE56ABD1869460409FEC19E81AEFB00D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
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    <link:label id="lab_us-gaap_ContractualObligationDueInFourthYear_CAFF4AB81D838667D45C19E81AEF869B_totalLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInFourthYear_CAFF4AB81D838667D45C19E81AEF869B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
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    <link:label id="lab_us-gaap_ContractualObligation_04F732E9F8F733D8E32419E81AEFFC13_totalLabel_en-US" xlink:label="lab_us-gaap_ContractualObligation_04F732E9F8F733D8E32419E81AEFFC13" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_88153BC01EB4C35713961CD370676DC3_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_88153BC01EB4C35713961CD370676DC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price Range [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_88153BC01EB4C35713961CD370676DC3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_88153BC01EB4C35713961CD370676DC3" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_88153BC01EB4C35713961CD370676DC3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise Price Range [Domain]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_866CB8856A1A402B20E11CD3706784C2" xlink:type="arc" />
    <link:label id="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543_terseLabel_en-US" xlink:label="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">$4.44 - 8.26</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543_label_en-US" xlink:label="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price Range One [Member]</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543_documentation_en-US" xlink:label="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise Price Range One [Member]</link:label>
    <link:loc xlink:href="asgn-20151231.xsd#asgn_ExercisePriceRangeOneMember" xlink:label="loc_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543" xlink:to="lab_asgn_ExercisePriceRangeOneMember_9985B63BF6F3CC43967F1CD370673543" xlink:type="arc" />
    <link:label id="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC_terseLabel_en-US" xlink:label="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">$10.46 - 11.75</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC_label_en-US" xlink:label="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price Range Two [Member]</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC_documentation_en-US" xlink:label="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise Price Range Two [Member]</link:label>
    <link:loc xlink:href="asgn-20151231.xsd#asgn_ExercisePriceRangeTwoMember" xlink:label="loc_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC" xlink:to="lab_asgn_ExercisePriceRangeTwoMember_7E048C406B12110D91501CD37067A8DC" xlink:type="arc" />
    <link:label id="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1_terseLabel_en-US" xlink:label="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">$12.90 - 12.90</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1_label_en-US" xlink:label="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price Range Three [Member]</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1_documentation_en-US" xlink:label="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise Price Range Three [Member]</link:label>
    <link:loc xlink:href="asgn-20151231.xsd#asgn_ExercisePriceRangeThreeMember" xlink:label="loc_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1" xlink:to="lab_asgn_ExercisePriceRangeThreeMember_5FBB6201CAE47D392B231CD3706782E1" xlink:type="arc" />
    <link:label id="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC_terseLabel_en-US" xlink:label="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">$13.31 - 13.58</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC_label_en-US" xlink:label="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price Range Four [Member]</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC_documentation_en-US" xlink:label="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise Price Range Four [Member]</link:label>
    <link:loc xlink:href="asgn-20151231.xsd#asgn_ExercisePriceRangeFourMember" xlink:label="loc_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC" xlink:to="lab_asgn_ExercisePriceRangeFourMember_78C0FBF5D16A84803ADA1CD370678BBC" xlink:type="arc" />
    <link:label id="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF_terseLabel_en-US" xlink:label="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">$16.51 - 16.51</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF_label_en-US" xlink:label="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price Range Five [Member]</link:label>
    <link:label id="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF_documentation_en-US" xlink:label="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise Price Range Five [Member]</link:label>
    <link:loc xlink:href="asgn-20151231.xsd#asgn_ExercisePriceRangeFiveMember" xlink:label="loc_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF" xlink:to="lab_asgn_ExercisePriceRangeFiveMember_12BFEF84A52A5611BAD11CD3706718CF" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise price, low end of the range (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_C961C4FC854A9D307FC91CD37068D996" xlink:type="arc" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_780E335479712E6D01131CD370685CA7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_780E335479712E6D01131CD370685CA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_780E335479712E6D01131CD370685CA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_780E335479712E6D01131CD370685CA7" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_780E335479712E6D01131CD370685CA7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5C4F6F12F85E4523B87B1CD370689310_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5C4F6F12F85E4523B87B1CD370689310" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options outstanding (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5C4F6F12F85E4523B87B1CD370689310" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5C4F6F12F85E4523B87B1CD370689310" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_5C4F6F12F85E4523B87B1CD370689310" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_BBBEDECFDE93475CD9C11CD370686819_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_BBBEDECFDE93475CD9C11CD370686819" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options outstanding - weighted average remaining contractual life (years)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_BBBEDECFDE93475CD9C11CD370686819" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_BBBEDECFDE93475CD9C11CD370686819" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_BBBEDECFDE93475CD9C11CD370686819" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_725B659A5188BB8D1AB41CD37068DF77_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_725B659A5188BB8D1AB41CD37068DF77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options outstanding - weighted average exercise price (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_725B659A5188BB8D1AB41CD37068DF77" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_725B659A5188BB8D1AB41CD37068DF77" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_725B659A5188BB8D1AB41CD37068DF77" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5EEF52EC6D29B7D2F2931CD370683477_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5EEF52EC6D29B7D2F2931CD370683477" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options exercisable - at the end of period (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5EEF52EC6D29B7D2F2931CD370683477" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5EEF52EC6D29B7D2F2931CD370683477" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5EEF52EC6D29B7D2F2931CD370683477" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_120B2BF5BCEA7046192B1CD370685AFB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_120B2BF5BCEA7046192B1CD370685AFB" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_120B2BF5BCEA7046192B1CD370685AFB" xlink:type="arc" />
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