    <SEC-DOCUMENT>0000890564-18-000011-index.html : 20180205
    <SEC-HEADER>0000890564-18-000011.hdr.sgml : 20180205
    <ACCEPTANCE-DATETIME>20180205172526
    ACCESSION NUMBER:		0000890564-18-000011
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		9
    CONFORMED PERIOD OF REPORT:	20180205
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20180205
    DATE AS OF CHANGE:		20180205

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ON ASSIGNMENT INC
    		CENTRAL INDEX KEY:			0000890564
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-HELP SUPPLY SERVICES [7363]
    		IRS NUMBER:				954023433
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-35636
    		FILM NUMBER:		18575281

    	BUSINESS ADDRESS:
    		STREET 1:		26745 MALIBU HILLS ROAD
    		CITY:			CALABASAS
    		STATE:			CA
    		ZIP:			91301
    		BUSINESS PHONE:		8188787900

    	MAIL ADDRESS:
    		STREET 1:		26745 MALIBU HILLS ROAD
    		CITY:			CALABASAS
    		STATE:			CA
    		ZIP:			91301
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>a8-kecs.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: a8-kecs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>exhibit991ecsfederal.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: exhibit991ecsfederal.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>exhibit992inforeliance.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 3 - file: exhibit992inforeliance.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>ecsimage1.jpg
    <TEXT>
    Document 4 - file: ecsimage1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>ecsimage2.jpg
    <TEXT>
    Document 5 - file: ecsimage2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>ecsimage3.jpg
    <TEXT>
    Document 6 - file: ecsimage3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>irimage2.jpg
    <TEXT>
    Document 7 - file: irimage2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>signature_dhg.gif
    <TEXT>
    Document 8 - file: signature_dhg.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>signaturea01.jpg
    <TEXT>
    Document 9 - file: signaturea01.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>