Mite families Ascidae, Blattisociidae and Melicharidae have long been considered members of a single family, Ascidae sensu lato (s.l.). Some mite species in these families are considered natural enemies of mite and insect pests; however, the diversity and biology of these mites remains unclear. This study reports a checklist containing the two families from Taiwan, Ascidae sensu stricto (s.s.) (2 genera, 13 species) and Blattisociidae (3 genera, 18 species), and provides all known synonyms and information on type depository, type locality, type habitat, and distribution for each included species.