In summer 2000, at necropsy of 24 Caspian seals (Phoca caspica), different organs were searched for parasite. Three species of trematodes: Stephanoprora advena, (100%) Cryptocotyle concava (100%) C. badamshini (100%) Corynosoma strumosum (100%) Corynosoma sp. (100%) 3rd stage larvae of Anisakis schupakowi (25%) were collected from alimentary canals and larvae of Halarachne sp. (12.5%) from nasal mucosa. These parasites are new host and distribution record for Caspian seals of IRAN. High frequency was observe for all species except that of Anisakis sp. and Halarachne sp.