The Japanese aircraft carrier Unryū was the lead ship of her class of fleet aircraft carriers built for the Imperial Japanese Navy (IJN) during World War II. She was commissioned in mid-1944, but fuel and aircrew shortages limited her use to Japanese waters. The impending American invasion of Luzon caused the IJN to order her to transport aircraft and supplies to the Philippines in December. The ship was torpedoed and sunk by the American submarine USS Redfish in the East China Sea during the voyage.

The Unryū-class aircraft carriers were World War II Japanese aircraft carriers. Sixteen ships of the class were planned under the Maru Kyū Programme and the Kai-Maru 5 Programme. However, only three of the Unryū-class carriers were completed.