Tanais was an ancient Greek city in the Don river delta.

Tanais may also refer to: Tanais River or Don River Tanais, a Soviet coaster wrecked in October 1943 SS Tanais, a German requisitioned cargo vessel torpedoed by a RN submarine in June 1944 Tanais (crustacean), a genus of arthropods 12492 Tanais, a main belt asteroid Tanaïs, author and perfumer formerly known as Tanwi Nandini Islam

See also Tanai (disambiguation)