Achelous (ancient Greek: Ἀχελῷος) is a river god in Greek mythology.

Achelous may also refer to:

rivers Achelous River, a river in western Greece Achelous River (Arcadia), a river in Arcadia, Greece Achelous River (Thessaly), a river in Thessaly, Greece Aheloy (river), a river in southeastern Bulgaria, known in Antiquity and the Middle Ages as Achelous Peiros, a river in Achaea, Greece, known in Antiquity as Achelous

other uses Achelous (crab), a genus of crabs in the family Portunidae Achelous (crater), an impact crater on Ganymede Achelous-class repair ship, a class of ship built by the US Navy during World War II USS Achelous (ARL-1), a 1942 repair ship

See also Acheloos (disambiguation)