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    <link:label id="lab_cdw_DeferredFinanceCostsNetandUnamortizedPremium_8A70BAFE1654B9C64954C33292345CBA_terseLabel_en-US" xlink:label="lab_cdw_DeferredFinanceCostsNetandUnamortizedPremium_8A70BAFE1654B9C64954C33292345CBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capitalized fees as deferred financing costs</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLoss_F50727D9D364D02F3E86BE968EA9B95D_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_F50727D9D364D02F3E86BE968EA9B95D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5EAA6A31788AEEF2C27FBE968EC18DAC_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5EAA6A31788AEEF2C27FBE968EC18DAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
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    <link:label id="lab_us-gaap_DepreciationAmortizationAndAccretionNet_230C4C437DA805C05783BE968EC6C069_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationAmortizationAndAccretionNet_230C4C437DA805C05783BE968EC6C069" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_7114EE3D20F4ABB43A55BE968EC6E80D_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_7114EE3D20F4ABB43A55BE968EC6E80D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity-based compensation expense</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_0AD68F186ED115FC7466BE968EC6C611_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_0AD68F186ED115FC7466BE968EC6C611" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in assets and liabilities:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_0AD68F186ED115FC7466BE968EC6C611_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_0AD68F186ED115FC7466BE968EC6C611" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingAssetsAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_0AD68F186ED115FC7466BE968EC6C611" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_3BF50CD2E31D33290E9DBE968EC6CE47" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Merchandise inventory</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Inventories</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B" xlink:to="lab_us-gaap_IncreaseDecreaseInInventories_E062C5F1C52AC4D5244CBE968EC6CB5B" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_F3B59B190DC9EB44F2C2BE968EC67FED_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_F3B59B190DC9EB44F2C2BE968EC67FED" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_F3B59B190DC9EB44F2C2BE968EC67FED_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_F3B59B190DC9EB44F2C2BE968EC67FED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Operating Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_F3B59B190DC9EB44F2C2BE968EC67FED" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableTrade_27CBDFB0CDC9A1A69729BE968EC64466_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableTrade_27CBDFB0CDC9A1A69729BE968EC64466" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable-trade</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableTrade_27CBDFB0CDC9A1A69729BE968EC64466_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableTrade_27CBDFB0CDC9A1A69729BE968EC64466" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable, Trade</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableTrade" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableTrade_27CBDFB0CDC9A1A69729BE968EC64466" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Current Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_E04508E4C4E9D3F3D8C0BE968EC60927" xlink:type="arc" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_7FA2CBFFB011BBE60B12BE968ED64641_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_7FA2CBFFB011BBE60B12BE968ED64641" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Noncurrent Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_7FA2CBFFB011BBE60B12BE968ED64641" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_7FA2CBFFB011BBE60B12BE968ED64641" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_7FA2CBFFB011BBE60B12BE968ED64641" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_1EB0E7B067BEEB3E1514BE968ED60304" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows used in investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AAD0C7BF7D50444D829EBE968ED6FFE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AA5D2ACA5CD4E3B75C4DBE968ED67FA5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AA5D2ACA5CD4E3B75C4DBE968ED67FA5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AA5D2ACA5CD4E3B75C4DBE968ED67FA5_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AA5D2ACA5CD4E3B75C4DBE968ED67FA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_AA5D2ACA5CD4E3B75C4DBE968ED67FA5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E611455606AB08D8002EBE968ED615DD_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E611455606AB08D8002EBE968ED615DD" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Premium payments on interest rate cap agreements</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForDerivativeInstrumentInvestingActivities" xlink:label="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_E611455606AB08D8002EBE968ED615DD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_5EA95C6B2BB4AF19C4E8BE968ED64B2B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_5EA95C6B2BB4AF19C4E8BE968ED64B2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_5EA95C6B2BB4AF19C4E8BE968ED64B2B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_5EA95C6B2BB4AF19C4E8BE968ED64B2B" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_5EA95C6B2BB4AF19C4E8BE968ED64B2B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_39B5F6925509E42CC65DBE968ED6F136_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_39B5F6925509E42CC65DBE968ED6F136" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows used in financing activities:</link:label>
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    <link:label id="lab_cdw_FixedChargeCoverageRatio_D5CBB6978E98F6E56C85911312CBEBD8_terseLabel_en-US" xlink:label="lab_cdw_FixedChargeCoverageRatio_D5CBB6978E98F6E56C85911312CBEBD8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidated fixed charge coverage ratio</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6D23E8FF610F677DB4F8911312CB1AA4" xlink:type="locator" />
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    <link:label id="lab_cdw_LineOfCreditFacilityMaximumAggregateIncrease_FF7AD44E2A088CBF9751911312CC9ABB_terseLabel_en-US" xlink:label="lab_cdw_LineOfCreditFacilityMaximumAggregateIncrease_FF7AD44E2A088CBF9751911312CC9ABB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum aggregate increase</link:label>
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    <link:loc xlink:href="cdw-20171231.xsd#cdw_LineOfCreditFacilityMaximumAggregateIncrease" xlink:label="loc_cdw_LineOfCreditFacilityMaximumAggregateIncrease_FF7AD44E2A088CBF9751911312CC9ABB" xlink:type="locator" />
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    <link:label id="lab_cdw_DebtInstrumentUnusedBorrowingCapacityFeeinbps_B9C0F8E6A73A4FF4A193911312CC16FC_terseLabel_en-US" xlink:label="lab_cdw_DebtInstrumentUnusedBorrowingCapacityFeeinbps_B9C0F8E6A73A4FF4A193911312CC16FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unused borrowing capacity</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_2D9F6BD9FD93E2180E5743EA79FAA4FE_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_2D9F6BD9FD93E2180E5743EA79FAA4FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Abstract]</link:label>
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    <link:label id="lab_cdw_CoworkerStockPurchasePlanMember_CF672E1461FC743878ED478796932B5A_documentation_en-US" xlink:label="lab_cdw_CoworkerStockPurchasePlanMember_CF672E1461FC743878ED478796932B5A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Coworker Stock Purchase Plan [Member]</link:label>
    <link:loc xlink:href="cdw-20171231.xsd#cdw_CoworkerStockPurchasePlanMember" xlink:label="loc_cdw_CoworkerStockPurchasePlanMember_CF672E1461FC743878ED478796932B5A" xlink:type="locator" />
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    <link:label id="lab_cdw_CoworkerRetirementandOtherCompensationBenefitsLineItems_64F207C822187DB11E7147879693CD14_label_en-US" xlink:label="lab_cdw_CoworkerRetirementandOtherCompensationBenefitsLineItems_64F207C822187DB11E7147879693CD14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Coworker Retirement and Other Compensation Benefits [Line Items]</link:label>
    <link:label id="lab_cdw_CoworkerRetirementandOtherCompensationBenefitsLineItems_64F207C822187DB11E7147879693CD14_documentation_en-US" xlink:label="lab_cdw_CoworkerRetirementandOtherCompensationBenefitsLineItems_64F207C822187DB11E7147879693CD14" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Line Items] for Coworker Retirement and Other Compensation Benefits [Table]</link:label>
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    <link:label id="lab_cdw_EmployeeStockPurchasePlandiscounttomarketpricepercent_7CFBD2CB75161531BE1D478796936C70_documentation_en-US" xlink:label="lab_cdw_EmployeeStockPurchasePlandiscounttomarketpricepercent_7CFBD2CB75161531BE1D478796936C70" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan, discount to market price, percent</link:label>
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    <link:label id="lab_us-gaap_SalesRevenueNet_403F4C4B8201334AD25A6DE446D0787E_terseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueNet_403F4C4B8201334AD25A6DE446D0787E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net sales</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_403F4C4B8201334AD25A6DE446D0787E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_4DD3B4DC91C8934303B76DE446D0137D_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_4DD3B4DC91C8934303B76DE446D0137D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of sales</link:label>
    <link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_4DD3B4DC91C8934303B76DE446D0137D_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_4DD3B4DC91C8934303B76DE446D0137D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Goods and Services Sold</link:label>
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    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_2AB65288A40339960F3F6DE446D0A6AA_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_2AB65288A40339960F3F6DE446D0A6AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expense</link:label>
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_4204C7283D776B0CF3DA6DE446D1F8C8_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_4204C7283D776B0CF3DA6DE446D1F8C8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Income from operations</link:label>
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    <link:label id="lab_cdw_ManagementFeeIncomeExpense_D5F87EA11A0976AAD6E16DE446D142EC_terseLabel_en-US" xlink:label="lab_cdw_ManagementFeeIncomeExpense_D5F87EA11A0976AAD6E16DE446D142EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Management fee</link:label>
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    <link:label id="lab_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_642E871578FA5BD788526DE446D1F235_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_642E871578FA5BD788526DE446D1F235" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on remeasurement of equity investment</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9C90F41A3E6FFA0FA764535AB82FFEA3_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9C90F41A3E6FFA0FA764535AB82FFEA3" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Options outstanding, beginning weighted-average exercise price (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_3252C444BDE1899A2F53535AB8413B64_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_3252C444BDE1899A2F53535AB8413B64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Grants, weighted average exercise price (in dollars per share)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_3252C444BDE1899A2F53535AB8413B64" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4528590A319303DC8DDE535AB8519EF0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4528590A319303DC8DDE535AB8519EF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeitures and Expirations, weighted average exercise price (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4528590A319303DC8DDE535AB8519EF0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4528590A319303DC8DDE535AB8519EF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price</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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4528590A319303DC8DDE535AB8519EF0" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4528590A319303DC8DDE535AB8519EF0" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_2D789371C94C51751607535AB9602CB4_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_2D789371C94C51751607535AB9602CB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercises, weighted average exercise price (in dollars per share)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_2D789371C94C51751607535AB9602CB4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9CDC29EF85A22C7F476B535D3D8E5033_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9CDC29EF85A22C7F476B535D3D8E5033" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Options outstanding, ending weighted-average exercise price (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_7A67B2A7DAA58274EC9B535ABA377110_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_7A67B2A7DAA58274EC9B535ABA377110" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</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_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_7A67B2A7DAA58274EC9B535ABA377110" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_7A67B2A7DAA58274EC9B535ABA377110" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BC3D2CEAF9A30306468C535ABA3A9065_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BC3D2CEAF9A30306468C535ABA3A9065" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Options, outstanding intrinsic value</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_BC3D2CEAF9A30306468C535ABA3A9065" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_5E275E2CD2FA3D6B0AE1425D87A37218_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_5E275E2CD2FA3D6B0AE1425D87A37218" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_PreferredStockValue_90A6FB413BD079CE7D866DE449308134_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_90A6FB413BD079CE7D866DE449308134" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Value, Issued</link:label>
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