Ryūhō (龍鳳, "Dragon phoenix" ?) was a light aircraft carrier of the Imperial Japanese Navy. She was converted from the submarine tender Taigei (大鯨, "Great Whale" ?), which had been used in the Second Sino-Japanese War. One of the least successful of the light aircraft carrier conversions due to its small size, slow speed and weak construction, during World War II, Ryūhō was used primarily as an aircraft transport and for training purposes, although she was also involved in a number of combat missions, including the First Battle of the Philippine Sea.