-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 VJmIF3kPUQd2Pfx0zMox8tFIP1GDNYB5EsjbJsdZVt2HbjMyAvzVXAdXGHoh6ndY
 +wbIyv3jUvQK6MEMc54lcQ==

<SEC-DOCUMENT>0000716039-03-000096.txt : 20030916
<SEC-HEADER>0000716039-03-000096.hdr.sgml : 20030916
<ACCEPTANCE-DATETIME>20030916155942
ACCESSION NUMBER:		0000716039-03-000096
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030916
FILED AS OF DATE:		20030916

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BROWN TOM INC /DE
		CENTRAL INDEX KEY:			0000014803
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				951949781
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		555 SEVENTEENTH ST SUITE 1850
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202
		BUSINESS PHONE:		9156829715

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BROWN TOM DRILLING CO INC
		DATE OF NAME CHANGE:	19710915

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			UNOCAL CORP
		CENTRAL INDEX KEY:			0000716039
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31308
		FILM NUMBER:		03897714

	BUSINESS ADDRESS:	
		STREET 1:		2141 ROSECRANS AVE
		STREET 2:		STE 4000
		CITY:			EL SEGUNDO
		STATE:			CA
		ZIP:			90245
		BUSINESS PHONE:		3107267600

	MAIL ADDRESS:	
		STREET 1:		2141 ROSECRANS AVE
		STREET 2:		STE 4000
		CITY:			EL SEGUNDO
		STATE:			CA
		ZIP:			90245
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>f4forunoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-09-16</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000014803</issuerCik>
        <issuerName>BROWN TOM INC /DE</issuerName>
        <issuerTradingSymbol>TMBR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000716039</rptOwnerCik>
            <rptOwnerName>UNOCAL CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2141 ROSECRANS AVE, SUITE 4000</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EL SEGUNDO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90245</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock $0.10 par value</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2003-09-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4925000.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.75</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>875000.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By subsidiary</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>

    </nonDerivativeTable>


    <derivativeTable>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Common stock reported herein has attached thereto preferred
share purchase rights.  Each right entitles the registered
holder to purchase, for the $120 per share exercise price,
shares of common stock or other securities of the company
(or, under certain circumstances, of the acquiring person)
worth twice the per share exercise price of the right.</footnote>
        <footnote id="F2">The shares are owned by Chicago Carbon Company, an Illinois
general partnership.  Union Oil Company of California is
the parent company of Lemont Carbon, Inc., Midwest 76 Inc.,
and Midwest Natural Gas Pipeline Co. - the general partners
of Chicago Carbon Company.  Unocal Corporation is the
parent company of Union Oil Company of California.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Brigitte M. Dewez, Corporate Secretary</signatureName>
        <signatureDate>2003-09-16</signatureDate>
    </ownerSignature>

</ownershipDocument>

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