Lisbon Maru (りすぼん丸) was a Japanese cargo liner built at Yokohama in 1920 for a Japanese shipping line. During World War II, the ship was requisitioned by the Japanese Army and turned into an armed troopship. On her final voyage, Lisbon Maru was being used to transport prisoners of war between Hong Kong and Japan when it was torpedoed by the submarine USS Grouper on 1 October 1942.