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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 0IDXBCTdxORHM0/MuHf0WQ==

<SEC-DOCUMENT>0000230557-05-000045.txt : 20050209
<SEC-HEADER>0000230557-05-000045.hdr.sgml : 20050209
<ACCEPTANCE-DATETIME>20050209164047
ACCESSION NUMBER:		0000230557-05-000045
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050207
FILED AS OF DATE:		20050209
DATE AS OF CHANGE:		20050209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Pulkstenis Eduard J
		CENTRAL INDEX KEY:			0001315707

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-08641
		FILM NUMBER:		05589191

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		973-948-3000

	MAIL ADDRESS:	
		STREET 1:		40 WANTAGE AVENUE
		CITY:			BRANCHVILLE
		STATE:			NJ
		ZIP:			07890

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SELECTIVE INSURANCE GROUP INC
		CENTRAL INDEX KEY:			0000230557
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				222168890
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		40 WANTAGE AVENUE
		CITY:			BRANCHVILLE
		STATE:			NJ
		ZIP:			07890
		BUSINESS PHONE:		2019483000

	MAIL ADDRESS:	
		STREET 1:		40 WANTAGE AVE
		STREET 2:		40 WANTAGE AVE
		CITY:			BRANCHVILLE
		STATE:			NJ
		ZIP:			07890

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SRI CORP
		DATE OF NAME CHANGE:	19860508
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c0001315707d20050209f4f.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-02-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000230557</issuerCik>
        <issuerName>SELECTIVE INSURANCE GROUP INC</issuerName>
        <issuerTradingSymbol>SIGI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001315707</rptOwnerCik>
            <rptOwnerName>Pulkstenis Eduard J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>40 WANTAGE AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BRANCHVILLE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07890</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-02-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>765</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>48.13</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16438.508</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Includes 189.327 shares acquired on February 7, 2005, through the dividend reinvestment feature of restricted stock which was granted under Selective's Stock Option Plan II and vested on February 7, 2005.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Eduard J Pulkstenis</signatureName>
        <signatureDate>2005-02-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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