A new Permian (Late Asselian-Dorashamian) ostracod fauna (66 species belonging to 35 genera) from Hydra Island (Greece) is described. Twelve new species are described: Hollinella (P.) hydraensis Crasquin-Soleau n.sp" Bairdia episkopiensis Crasquin-Soleau n.sp." Bairdia rigasensis Crasquin-Soleau n.sp."Bairdia thikiaensis Crasquin-Soleau n.sp." Chanzishaella rnarrnariensis Crasquin-Soleau n.sp." Cypridina gussevaae Crasquin-Soleau n.sp." Cyathus bar1nariensis Crasquin-Soleau n.sp." Cyathus klirnakiensis Crasquin-Soleau n.sp." Bairdiacypris bistiensis Crasquin-Soleau n.sp." Shishaella hellenensis Crasquin-Soleau n.sp., Bairdia ishizakii Crasquin-Soleau n.sp., Petasobairdia kozuri Crasquin-Soleau ll.Sp. Forty-four other species are figured. This assemblage is characteristic of a shallo"W" 'W'ater platform. The palaeobiogeographic relationships are presented and represent significant additions to the Permian Palaeo-Tethyan ostracod faunas. J . .Micropalaeontol. 17(2): 131-152" December 1998.