The Yokohama Maru was a 6143 gross ton passenger and cargo vessel built by Mitsubishi Dockyard & Engine Works, Nagaski for Nippon Yusen Kabushiki Kaisha and launched in 1912. The ship was used on the Guam to Japan route. She was requisitioned by the Imperial Japanese Army and fitted out as a troop transport. On 10 March 1942, while being unloaded off Salamaua, Yokohama Maru was attacked as part of the invasion fleet at Lae and Salamaua and was sunk at 07°01′S 147°07′E / 7.017°S 147.117°E.