Ryoyo Maru (1930)

The Ryoyo Maru (良洋丸) was a 5,974-gross register ton passenger ship that was built by Kawasaki Dockyard Company, Kobe, for Tōyō Kisen Kabushiki Kaisha, launched in 1931. She was requisitioned by the Imperial Japanese Army and fitted out as a fast troop transport.

She was part of the invasion fleet that landed troops during the invasion of Ambon on 30 January 1942, and part of the invasion fleet at Buna and Gona.

On 4 March 1944, she was damaged when struck by a large wave and driven aground off Matsuwa Jima, in the Kuril Islands. Ryoyo Maru was anchored in a harbour along the Kuril Islands, when she was struck by a torpedo from USS Tautog (SS-199) on 2 May. She settled in 24 ft of water, decks awash at 48-04N, 153-16E.