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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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 zCx6d18J1qPO2+xEq2Z45Q==

<SEC-DOCUMENT>0001281829-06-000011.txt : 20060316
<SEC-HEADER>0001281829-06-000011.hdr.sgml : 20060316
<ACCEPTANCE-DATETIME>20060316162733
ACCESSION NUMBER:		0001281829-06-000011
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060315
FILED AS OF DATE:		20060316
DATE AS OF CHANGE:		20060316

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DIGITAL FUSION INC/NJ/
		CENTRAL INDEX KEY:			0001057257
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
		IRS NUMBER:				133817344
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4940-A CORPORATE DRIVE
		CITY:			HUNTSVILLE
		STATE:			AL
		ZIP:			35805
		BUSINESS PHONE:		2568372620

	MAIL ADDRESS:	
		STREET 1:		4940-A CORPORATE DRIVE
		CITY:			HUNTSVILLE
		STATE:			AL
		ZIP:			35805

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IBS INTERACTIVE INC
		DATE OF NAME CHANGE:	19980306

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			THORNTON STEVEN
		CENTRAL INDEX KEY:			0001313347

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24073
		FILM NUMBER:		06692318

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		256-837-2620

	MAIL ADDRESS:	
		STREET 1:		C/O DIGITAL FUSION, INC.
		STREET 2:		4940-A CORPORATE DRIVE
		CITY:			HUNTSVILLE
		STATE:			AL
		ZIP:			35805
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-03-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001057257</issuerCik>
        <issuerName>DIGITAL FUSION INC/NJ/</issuerName>
        <issuerTradingSymbol>DIGF.OB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001313347</rptOwnerCik>
            <rptOwnerName>THORNTON STEVEN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DIGITAL FUSION, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>4940-A CORPORATE DRIVE</rptOwnerStreet2>
            <rptOwnerCity>HUNTSVILLE</rptOwnerCity>
            <rptOwnerState>AL</rptOwnerState>
            <rptOwnerZipCode>35805</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>V.P. Engineering Development</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5950</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.65</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>165000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Elena Crosby, Attorney-In-Fact for Steven Thornton</signatureName>
        <signatureDate>2006-03-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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