Novel dioxazine compounds of the formula ##STR1## in which Z is a basic group, which can be quaternized, Y is an anionic group and X and X.sub.1 independently of one another are identical or different substituents from the category comprising: hydrogen, halogen, CN, substituted or unsubstituted alkyl (C.sub.1 -C.sub.4); substituted or unsubstituted phenyl; NHCOR.sub.1 in which R.sub.1 is alkyl (C.sub.1 -C.sub.4), cycloalkyl, substituted or unsubstituted aryl or a heterocyclic radical; and OCOR.sub.2 in which R.sub.2 is substituted or unsubstituted alkyl (C.sub.1 -C.sub.4) or cycloalkyl; or X and X.sub.1 are the group ##STR2## in which R.sub.4 and R.sub.5 independently of one another are: hydrogen, substituted or unsubstituted alkyl (C.sub.1 -C.sub.4), cycloalkyl or aryl, or R.sub.4 together with R.sub.5 and with the inclusion of the N atom forms a heterocyclic ring, or X and X.sub.1 are the group COOR.sub.6, in which R.sub.6 is hydrogen, substituted or unsubstituted alkyl or cycloalkyl; n is a number from 1 to 4 and m is a number from 0 to 2, with the proviso that the number m is smaller than n, and in which the benzo radicals A and A.sub.1 can be identical or different and can have one or more further substituents, their preparation and their use as dyes, in particular for dyeing and printing natural and regenerated cellulose materials without the addition of salt, are described.