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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Jr1/RAxGeskF5+b9XLR209bfk2qYLd6+Lc7OvCUOMIf1dNochPX4pVt8f9TFYNAV
 OHPYdqmAy042xX1FsHqnVA==

<SEC-DOCUMENT>0001179110-03-006052.txt : 20030820
<SEC-HEADER>0001179110-03-006052.hdr.sgml : 20030820
<ACCEPTANCE-DATETIME>20030820193225
ACCESSION NUMBER:		0001179110-03-006052
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030820
FILED AS OF DATE:		20030820

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTRUSION INC
		CENTRAL INDEX KEY:			0000736012
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER COMMUNICATIONS EQUIPMENT [3576]
		IRS NUMBER:				751911917
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1101 ARAPAHO ROAD
		CITY:			RICHARDSON
		STATE:			TX
		ZIP:			75081
		BUSINESS PHONE:		9722346400

	MAIL ADDRESS:	
		STREET 1:		1101 ARAPAHO ROAD
		CITY:			RICHARDSON
		STATE:			TX
		ZIP:			75081

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTRUSION COM INC
		DATE OF NAME CHANGE:	20000601

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ODS NETWORKS INC
		DATE OF NAME CHANGE:	19970507

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OPTICAL DATA SYSTEMS INC
		DATE OF NAME CHANGE:	19950517

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HEMPHILL GARRY
		CENTRAL INDEX KEY:			0001231367

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20191
		FILM NUMBER:		03858940

	BUSINESS ADDRESS:	
		STREET 1:		1101 EAST ARAPAHO ROAD
		CITY:			RICHARDSON
		STATE:			TX
		ZIP:			75081
		BUSINESS PHONE:		9722346400

	MAIL ADDRESS:	
		STREET 1:		1101 EAST ARAPAHO ROAD
		CITY:			RICHARDSON
		STATE:			TX
		ZIP:			75081
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
<periodOfReport>2003-08-20</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000736012</issuerCik>
        <issuerName>INTRUSION INC</issuerName>
        <issuerTradingSymbol>INTZ</issuerTradingSymbol>
</issuer>
<reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001231367</rptOwnerCik>
            <rptOwnerName>HEMPHILL GARRY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1101 E ARAPAHO ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>RICHARDSON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75081</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>1</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle>Vice President Operations</officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable></nonDerivativeTable>
<derivativeTable><derivativeTransaction><securityTitle><value>Incentive Stock Option (Right to Buy)</value>
</securityTitle>
<conversionOrExercisePrice><value>.67</value>
</conversionOrExercisePrice>
<transactionDate><value>2003-08-20</value>
</transactionDate>
<transactionCoding><transactionFormType>4</transactionFormType>
<transactionCode>A</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionAmounts><transactionShares><value>10000</value>
</transactionShares>
<transactionPricePerShare><value>.67</value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode><value>A</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<exerciseDate><value>2004-08-20</value>
<footnoteId id="F1"></footnoteId>
</exerciseDate>
<expirationDate><value>2013-08-20</value>
</expirationDate>
<underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value>
</underlyingSecurityTitle>
<underlyingSecurityShares><value>10000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<postTransactionAmounts><sharesOwnedFollowingTransaction><value>10000</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature><directOrIndirectOwnership><value>D</value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeTransaction>
</derivativeTable>
<footnotes><footnote id="F1">The option vests 100% one year from the date of grant.</footnote>
</footnotes>
<ownerSignature><signatureName>/s/ Garry L Hemphill</signatureName>
<signatureDate>2003-08-20</signatureDate>
</ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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