    <SEC-DOCUMENT>0001193125-18-117865-index.html : 20180416
    <SEC-HEADER>0001193125-18-117865.hdr.sgml : 20180416
    <ACCEPTANCE-DATETIME>20180416084607
    ACCESSION NUMBER:		0001193125-18-117865
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		32
    CONFORMED PERIOD OF REPORT:	20180531
    FILED AS OF DATE:		20180416
    DATE AS OF CHANGE:		20180416
    EFFECTIVENESS DATE:		20180416

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			WESCO INTERNATIONAL INC
    		CENTRAL INDEX KEY:			0000929008
    		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES [5063]
    		IRS NUMBER:				251723342
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-14989
    		FILM NUMBER:		18755643

    	BUSINESS ADDRESS:
    		STREET 1:		225 WEST STATION SQUARE DRIVE
    		STREET 2:		STE 700
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15219
    		BUSINESS PHONE:		4124542200

    	MAIL ADDRESS:
    		STREET 1:		225 WEST STATION SQUARE DRIVE
    		STREET 2:		STE 700
    		CITY:			PITTSBURGH
    		STATE:			PA
    		ZIP:			15219

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	CDW HOLDING CORP
    		DATE OF NAME CHANGE:	19971217
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>d524119ddef14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: d524119ddef14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>g524119g07b47.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: g524119g07b47.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g524119g07e03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g524119g07e03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g524119g07j54.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g524119g07j54.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g524119g09g08.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g524119g09g08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g524119g16j10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g524119g16j10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g524119g26b76.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g524119g26b76.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g524119g26v98.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g524119g26v98.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g524119g32s63.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g524119g32s63.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g524119g45v33.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g524119g45v33.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g524119g46h72.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g524119g46h72.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g524119g48v62.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g524119g48v62.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g524119g51c40.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g524119g51c40.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g524119g51l20.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g524119g51l20.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g524119g55j43.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g524119g55j43.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g524119g55n49.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g524119g55n49.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g524119g59f58.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g524119g59f58.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g524119g62b20.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g524119g62b20.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g524119g69o28.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g524119g69o28.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g524119g73y49.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g524119g73y49.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g524119g77i15.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g524119g77i15.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>g524119g77v07.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: g524119g77v07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>g524119g85f62.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: g524119g85f62.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>g524119g88e67.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: g524119g88e67.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>g524119g93z03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: g524119g93z03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>g524119g95d42.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: g524119g95d42.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>g524119g96c37.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: g524119g96c37.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>g524119g97h79.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: g524119g97h79.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>g524119inperson7.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: g524119inperson7.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>g524119pc01a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: g524119pc01a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>g524119pc01b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: g524119pc01b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>g524119pc02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: g524119pc02.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>