I-57, later I-157, was an Imperial Japanese Navy Kaidai-class cruiser submarine commissioned in 1929. During World War II, she supported Japanese forces during the invasion of Malaya in December 1941, the Dutch East Indies campaign in early 1942, and the Battle of Midway in June 1942. She then served on training duties — except for a brief period of participation in the Aleutian Islands campaign in 1943 — until she was converted into a kaiten manned suicide attack torpedo carrier in 1945. She surrendered to the Allies at the end of the war in 1945 and was scuttled in 1946.