-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 ONLBJqrwGLFXhxk8fvytSpTfbDTeN1OnTEPsPaLEH9Eccqg9jNkNigVVSW2CuQ07
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<SEC-DOCUMENT>0001140361-10-040837.txt : 20101012
<SEC-HEADER>0001140361-10-040837.hdr.sgml : 20101011
<ACCEPTANCE-DATETIME>20101012150127
ACCESSION NUMBER:		0001140361-10-040837
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060126
FILED AS OF DATE:		20101012
DATE AS OF CHANGE:		20101012

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Cook Jeff
		CENTRAL INDEX KEY:			0001258146

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14837
		FILM NUMBER:		101118936

	MAIL ADDRESS:	
		STREET 1:		801 CHERRY STREET
		STREET 2:		SUITE 3700, UNIT 19
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76102

	FORMER NAME:	
		FORMER CONFORMED NAME:	Cook Paul J.
		DATE OF NAME CHANGE:	20070806

	FORMER NAME:	
		FORMER CONFORMED NAME:	COOK JEFF
		DATE OF NAME CHANGE:	20030804

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUICKSILVER RESOURCES INC
		CENTRAL INDEX KEY:			0001060990
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				752756163
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		801 CHERRY STREET
		STREET 2:		SUITE 3700, UNIT 19
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76102
		BUSINESS PHONE:		817-665-5000

	MAIL ADDRESS:	
		STREET 1:		801 CHERRY STREET
		STREET 2:		SUITE 3700, UNIT 19
		CITY:			FORT WORTH
		STATE:			TX
		ZIP:			76102
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2006-01-26</periodOfReport>

    <dateOfOriginalSubmission>2006-01-30</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001060990</issuerCik>
        <issuerName>QUICKSILVER RESOURCES INC</issuerName>
        <issuerTradingSymbol>KWK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001258146</rptOwnerCik>
            <rptOwnerName>Cook Jeff</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>801 CHERRY STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 3700, UNIT 19</rptOwnerStreet2>
            <rptOwnerCity>FORT WORTH</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>76102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP - Operations</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $.01 per value</value>
            </securityTitle>
            <transactionDate>
                <value>2006-01-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>15500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>281833</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On June 30, 2005, the common stock of Quicksilver Resources Inc. split three-for-two, resulting in the reporting person's ownership of 88,778 additional shares of common stock (not 88,777 shares as previously reported due to a rounding error).</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Paul Jeffrey Cook</signatureName>
        <signatureDate>2010-10-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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