The Sagara Maru was a Japanese Sakito Maru class cargo liner converted to seaplane tender that served during World War II. It was hit by torpedoes from two different submarines before being finally sunk and abandoned. Sagara Maru was built in 1939 at the Mitsubishi Yokohoma shipyard for the Nippon Yusen company, being completed in 1940. She was the fifth of seven ships of the Sakito Maru-class of high speed transports: Sakito Maru (崎戸丸), Sanuki Maru (讃岐丸), Sado Maru (佐渡丸), Sagami Maru (相模丸), Sagara Maru (相良丸), Sasako Maru (笹子丸), and Sakura Maru (佐倉丸).