Abstract Twenty-seven species of terrestrial Isopoda are recorded from Socotra Island (Yemen). One genus (Dumetoniscus) in the family Bathytropidae and three species (Serendibia cavernicola, Dumetoniscus graniticus and Platyarthrus alticolus) are described as new. A key to the 41 species of Oniscidea presently known from the Socotra Archipelago is given. The new records confirm the high number of endemics present on this archipelago.