Bythinellaanatolica sp. n., Bythinellaistanbulensis sp. n., Bythinellamagdalenae sp. n., and Bythinellawilkei sp. n. from western Turkey are described herein. Illustrations of the shell and genitalia of the newly described taxa, together with comparisons with previously known Bythinella taxa and a key to the species from western Turkey, are also provided.