    <SEC-DOCUMENT>0001104659-21-038338-index.html : 20210318
    <SEC-HEADER>0001104659-21-038338.hdr.sgml : 20210318
    <ACCEPTANCE-DATETIME>20210318160243
    ACCESSION NUMBER:		0001104659-21-038338
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		4
    CONFORMED PERIOD OF REPORT:	20210429
    FILED AS OF DATE:		20210318
    DATE AS OF CHANGE:		20210318

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Information Services Group Inc.
    		CENTRAL INDEX KEY:			0001371489
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MANAGEMENT CONSULTING SERVICES [8742]
    		IRS NUMBER:				205261587
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33287
    		FILM NUMBER:		21754337

    	BUSINESS ADDRESS:
    		STREET 1:		2187 ATLANTIC STREET
    		CITY:			STAMFORD
    		STATE:			CT
    		ZIP:			06902
    		BUSINESS PHONE:		203-517-3100

    	MAIL ADDRESS:
    		STREET 1:		2187 ATLANTIC STREET
    		CITY:			STAMFORD
    		STATE:			CT
    		ZIP:			06902
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>tm212411-1_def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: tm212411-1_def14a.htm

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

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm212411d1_pc1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm212411d1_pc1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tm212411d1_pc2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm212411d1_pc2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>