The motor vessel MV Mamutu was an Australian merchant ship built in Hong Kong in 1938. She was of 300 gross tons, 113 feet (34.4 m) in length, and had a beam of 25 feet (7.6 m). She operated on an inter-island trade route for Burns Philp & Company, and at the outbreak of World War II, she was engaged in the evacuation of civilians ahead of advancing Japanese forces in New Guinea. The Mamutu sunk in August 1942 after being attacked by a Japanese submarine Ro-33 in the Gulf of Papua near Murray Island.