Odostomia clessini is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. According to ITIS, this species is a synonym of Odostomia tenuisculpta Carpenter, 1864. Dall & Bartsch made their distinction on the following basis : O. tenuisculpta has the incised spiral lines strong on the early whorls and much finer on the later turns, while O. clessini has the incised spiral lines only moderately strong.