Thiopheneazo dyes of the formula ##STR1## where X is cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl,Y is halogen, hydroxyl, mercapto, substituted or unsubstituted C.sub.1 -C.sub.6 -alkoxy, C.sub.5 -C.sub.7 -cycloalkoxy, substituted or unsubstituted phenoxy, substituted or unsubstituted C.sub.1 -C.sub.6 -alkylthio, C.sub.5 -C.sub.7 -cycloalkylthio, substituted or unsubstituted phenylthio, C.sub.1 -C.sub.6 -alkylsulfonyl or substituted or unsubstituted phenylsulfonyl,Z is nitro, cyano, C.sub.1 -C.sub.4 -alkanoyl, benzoyl, C.sub.1 -C.sub.4 -alkylsulfonyl, phenylsulfonyl or a radical of the formula --CH.dbd.CB.sup.1 B.sup.2 or --CH.dbd.N--B.sup.3, in which B.sup.1 and B.sup.2 independently of the other are cyano, substituted or unsubstituted C.sub.1 -C.sub.6 -alkoxycarbonyl or C.sub.3 -C.sub.6 -alkenyloxycarbonyl or one of B.sup.1 and B.sup.2 is cyano and the other is C.sub.1 -C.sub.4 -alkylsulfonyl, substituted or unsubstituted phenyl, benzoyl, phenylsulfonyl or carbamoyl and B.sup.3 is hydroxyl, C.sub.1 -C.sub.4 -alkoxy, phenoxy or phenylamino,R.sup.1 is C.sub.1 -C.sub.4 -alkoxy,R.sup.2 is hydrogen, substituted or unsubstituted C.sub.1 -C.sub.10 -alkyl or R.sup.3,R.sup.3 is a radical of the formula CH.sub.2 --CH(OR.sup.5)--CH.sub.2 R.sup.6 andR.sup.4 is substituted or unsubstituted C.sub.1 -C.sub.6 -alkanoylamino or substituted or unsubstituted benzoylamino,R.sup.5 being hydrogen, C.sub.1 -C.sub.10 -alkanoyl, C.sub.1 -C.sub.10 -alkoxycarbonyl or C.sub.1 -C.sub.10 -mono- or -dialkyl-carbamoyl, the alkyl groups of said substituents being uninterrupted or interrupted by oxygen atoms, andR.sup.6 being chlorine, bromine hydroxyl or substituted or unsubstitutedare useful for dyeing textile fibers.