-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 90JseU578R3CsS1t56VDgg==

<SEC-DOCUMENT>0000945564-10-000003.txt : 20101223
<SEC-HEADER>0000945564-10-000003.hdr.sgml : 20101223
<ACCEPTANCE-DATETIME>20101223154332
ACCESSION NUMBER:		0000945564-10-000003
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20101221
FILED AS OF DATE:		20101223
DATE AS OF CHANGE:		20101223

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FX ENERGY INC
		CENTRAL INDEX KEY:			0000907649
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				870504461
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3006 HIGHLAND DR
		STREET 2:		STE 206
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84106
		BUSINESS PHONE:		801-486-5555

	MAIL ADDRESS:	
		STREET 1:		3006 HIGHLAND DR
		STREET 2:		STE 206
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84106

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FRONTIER OIL EXPLORATION CO
		DATE OF NAME CHANGE:	19940223

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PIERCE DAVID N
		CENTRAL INDEX KEY:			0000945564
		STATE OF INCORPORATION:			UT
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35012
		FILM NUMBER:		101272263

	MAIL ADDRESS:	
		STREET 1:		3006 HIGHLAND DR
		STREET 2:		STE 206
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84106
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-12-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000907649</issuerCik>
        <issuerName>FX ENERGY INC</issuerName>
        <issuerTradingSymbol>FXEN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000945564</rptOwnerCik>
            <rptOwnerName>PIERCE DAVID N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3006 HIGHLAND DR</rptOwnerStreet1>
            <rptOwnerStreet2>STE 206</rptOwnerStreet2>
            <rptOwnerCity>SALT LAKE CITY</rptOwnerCity>
            <rptOwnerState>UT</rptOwnerState>
            <rptOwnerZipCode>84106</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-12-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>42000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>418389</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By IRA</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>58020</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By 401(k)</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By spouse</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Restricted stock award that vests in three equal annual installments beginning December 21, 2011.</footnote>
        <footnote id="F2">Includes 14,000 restricted shares that vest on December 21, 2011, 28,000 restricted shares that vest in two equal annual installments beginning December 21, 2011, and 42,000 restricted shares that vest in three equal annual installments beginning December 21, 2011.</footnote>
        <footnote id="F3">The reporting person disclaims beneficial ownership of securities held for the benefit of minor children and the report shall not be deemed an admission that the reporting person is the owner of such securities for the purpose of Section 16 or for any other purpose.</footnote>
        <footnote id="F4">Includes 34,000 shares held for the benefit of minor children.</footnote>
        <footnote id="F5">Shares contributed by the issuer to the reporting person's 401(k).</footnote>
        <footnote id="F6">Shares held for the benefit of minor children.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>David N. Pierce</signatureName>
        <signatureDate>2010-12-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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