Tanais (disambiguation)

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