A total of 200 fishes belonging to nine species were sampled from the Sea of Marmara. Thirteen trematode species were recorded in the intestine of these hosts: Helicometra fasciata and Diphterostomum brusinae in Zosterisessor ophiocephalus; Monascus filiformis in Trachurus trachurus; Dicrogaster purpusilla, Schikhobalotrema sparisomae and Sacccocoelium obesum in Liza saliens; Macvicaria alacris, H. fasciata and Gaevskajatrema perezi in Symphodus tinca; Anisocladium fallax and A. capitellum in Uranoscopus scaber; Stephanostomum caducum in Merluccius merluccius; Bucephalus marinus, Stephanostomum gaidropsari and H. fasciata in Gaidopsarus mediterraneus; H. fasciata in Scorpaena scrofa and Gobius cobitis.