Jingei , was the lead vessel of the Jingei-class submarine tenders operated by the Imperial Japanese Navy, from the 1920s through World War II. She was the first purpose-built submarine tender in the Imperial Japanese Navy.

The Japanese cruiser Ibuki (伊吹) was a heavy cruiser built for the Imperial Japanese Navy (IJN) during World War II. The lead ship of her class of two ships, she was ordered to be converted into a light aircraft carrier in 1943 before completion to help replace the aircraft carriers sunk during the Battle of Midway in mid-1942. The conversion was delayed and finally stopped in March 1945 in order to concentrate on building small submarines. Ibuki was scrapped in the Sasebo Naval Arsenal beginning in 1946.