SS Mongolia may refer to:
SS Mongolia (Caird, 1903), a 9,505 GT British passenger and cargo liner of the Peninsular and Oriental Steam Navigation Company (P&O) (sunk in 1917)
SS Mongolia (1903), a 13,369 GT American passenger and cargo liner of the Pacific Mail Steamship Company
SS Mongolia (1922), a 16,504 GT British passenger and cargo liner of the Peninsular and Oriental Steam Navigation Company (P&O)
