Kelliaichthys is an extinct genus of prehistoric bony fish that lived during the Cisuralian (early Permian) epoch in what is now East Kazakhstan, Kazakhstan. It was originally named "Kellia" by Kazantseva-Selezneva (1980).[1] Because this genus name was already given to an extant lasaeid bivalve (Kellia Turton, 1822),[2] the new name Kelliaichthys was erected for the Permian fish. The genus includes a single species (monotypy): Kelliaichthys velox.