The morphological and morphometric variability of species belonging to the mite family Scutacaridae was broadly unknown until now. This study is the first comprehensive one to deal with the intra- and interspecific variability of particular scutacarid species belonging to different genera. For the analyses, traditional morphometric approaches (univariate and multivariate) have been applied. Moreover, geometric morphometric methods have been used as a novelty for Scutacaridae. The effects of different factors (laboratory cultures, geographic location, and dimorphism) on morphology and variability were studied. Specimens from laboratory cultures differ slightly from individuals from field collections because of size differences of particular characters as well as because of higher character variability. There are no differences in the general ?size? of the mites, which was defined through the entity of all variables. Geographic variation even between several spatially widely distributed populations belonging to the same species is low. Again, differences between populations are not caused by ?size?. Populations of one species that are similar morphologically are not implicitly located in geographical vicinity to each other. The female dimorphism, which is present in several species, clearly influences the morphometric variables and in most cases the ?size? of the mites as well. The differences between the two morphs are genus- specific in the material studied. Non- phoretomorph females display higher variability of characters.The morphology of the investigated mites is not altered strongly by laboratory cultures or geographic variation, thus species differentiation even between extremely similar species is not hampered. The differences between phoretomorphs and non- phoretomorphs, however, are more likely to cause problems in species delimitation.