<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-03-29</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000887591</issuerCik>
        <issuerName>FIBERMARK INC</issuerName>
        <issuerTradingSymbol>FMK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001245462</rptOwnerCik>
            <rptOwnerName>NORRIE K PETER</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P. O. BOX 498</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BRATTLEBORO</rptOwnerCity>
            <rptOwnerState>X1</rptOwnerState>
            <rptOwnerZipCode>05302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>24537</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>family limited partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>OPTION (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6.00</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2004-05-16</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7500</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7500</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>family limited partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>OPTION (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.41</value>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2006-05-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15000</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22500</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>family limited partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>OPTION (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19.44</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2008-05-05</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>30000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>family limited partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>OPTION (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19.44</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <value>2008-05-05</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>45000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Family limited partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Note 1:  Options granted on May 16, 1994, under the 1994 Directors Stock Option Plan.  Said plan, adopted February 28, 1994, contains certain vesting contingencies summarized below.
20% of the shares shall become exercisable immediately
80% of the shares shall become exercisable in installments over a period of four (4) years from the date of grant at the rate of 20% per year in 4 equal installments commencing on May 16, 1995.  These options were subject to a 3 for 2 stock split on May 6, 1997.</footnote>
        <footnote id="F2">NOTE 2:  Options granted on May 9, 1996, under the Amended 1994 Directors Stock Option Plan.  Said Amendment, dated May 9, 1996, contains certain vesting contingencies, summarized below.
50% of New Options vest and become exercisable as of the 20th consecutive trading day at which the stock reached a closing price level of at least $18 per share or the stock is valued at $18 per share in a merger or asset sale.
25% of New Options vest and become exercisable as of the 20th consecutive trading day at which the stock reached a closing price level of at least $22 per share or the stock is valued at $22 per share in a merger or asset sale.
25% of New Options vest and become exercisable as of the 20th consecutive trading day at which the stock reached a closing price level of at least $26 per share or the stock is valued at $26 per share in a merger or asset sale. These options were subject to a 3 for 2 stock split on May 6, 1997.</footnote>
        <footnote id="F3">Note 3:  Stock options granted on May 5, 1998, under the 1998 Amended and Restated Non-Employee Directors Stock Option Plan--Base Grant Shares--will vest at a rate of 20% per year over a period of five (5) years, commencing on the first anniversary of the grant date and continuing thereafter annually.  For further details, please refer to the proxy statement.</footnote>
        <footnote id="F4">Note 4:  Options granted on May 5, 1998, under the 1998 Amended and Restated Non-Employee Directors Stock Option Plan--Performance Grant Shares. Said plan, dated February 18, 1998, contains certain vesting contingencies, summarized below. For further details, please refer to the proxy statement.
50% of these Options vest and become exercisable as of the 20th consecutive trading day at which the stock reached a closing price of at least $30 per share or the stock is valued at $30 per share in a merger or asset sale.
25% of these Options vest and become exercisable as of the 20th consecutive trading day at which the stock reached a closing price of at least $34 per share or the stock is valued at $34 per share in a merger or asset sale.
25% of these Options vest and become exercisable as of the 20th consecutive trading day at which the stock reached a closing price of at least $38 per share or the stock is valued at $38 per share in a merger or asset sale.</footnote>
    </footnotes>

    <remarks>Resignation as a director, effective March 29, 2004.</remarks>

    <ownerSignature>
        <signatureName>Alex Kwader POA for K. Peter Norrie</signatureName>
        <signatureDate>2004-03-31</signatureDate>
    </ownerSignature>
</ownershipDocument>

