Abstract: Eleven new species of nemacheilid fishes, included in genera Barbatula, Schistura and Seminemacheilus are described various fershwater basin systems in Turkey. New species are distinguished by following characters: general shape of the body and of head, fin rays formulas, shape of mouth and lips, presence/absence of processus dentiformis on the upper jaw, suborbital flap on the head, adipose crests above and below the caudal peduncle, complete or incomplete of lateral line, swim-bladder bony capsule shape and colour pattern. Besides, some morphometric ratios derived from twenty-seven morphometric characters are used in the study.