ABSTRACT The aim of this work was to investigate mollusc fauna of some freshwater ecosystems in Sinop and Bafra. The samples were obtained from littoral zones (0.5-1.5 m) by using handle dredge, spatula, handle oar. As a result of this study, 12 species belonging to Gastropoda and 6 species belonging to Bivalvia, totally 18 Mollusca species were determined.  Valvata pulchella  Studer,1820, Gyraulus parvus  (Say,1817) (Gastropoda), Unio mancus eucirrus Bourguignat,1860 (Bivalvia) are new records for the Mollusca fauna of freshwaters of Turkey.  Key Words: Gastropoda, Bivalvia, freshwater, the Black Sea Region.