The invention concerns naphtholactam derivatives of formula (I), in which: R.sup.1 represents hydrogen, optionally substituted C.sub.1 -C.sub.6 alkyl C.sub.5 -C.sub.6 cycloalkcyl or substituted phenyl; R.sup.2 and R.sup.3 represent hydrogen, C.sub.1 -C.sub.8 alkanoyl, optionally substituted benzoyl, optionally substituted C.sub.2 -C.sub.4 alkyl, optionally substituted C.sub.2 -C.sub.4 alkenyl, optionally substituted C.sub.2 -C.sub.4 alkinyl, a halogen, nitro, sulphamoyl, optionally substituted hydroxy, optionally substituted mercapto, C.sub.1 -C.sub.6 alkysulphonyl or optionally substituted phenylsulphonyl; R.sup.4 represents hydrogen or, with R.sup.3, a group of formula (II); R.sup.5 represents hydrogen or C.sub.1 -C.sub.6 alkyl; R.sup.6 represents cyano, carbamoyl, C.sub.1 -C.sub.4 mono- or dialkylcarbamoyl carboxyl or C.sub.1 -C.sub.4 alkoxycarbonyl; and R.sup.7 represents substituted C.sub.1 -C.sub.4 alkyl, optionally substituted C.sub.5 -C.sub.13 alkyl or benzoyl. Also disclosed is the use of these derivatives for dyeing or printing textiles.