The 343rd Naval Air Group (第三四三海軍航空隊, Dai San-Yon-San Kaigun Kōkūtai) was an aircraft and airbase garrison unit of the Imperial Japanese Navy (IJN) during the Pacific campaign of World War II.

Created in late 1944 due to the desperate situation of Japan in the closing stages of the war, the 343rd was composed of the best surviving ace fighter pilots the Imperial Navy had at the time, with Captain Minoru Genda in command.

On 18 March 1945, one of the "Myrts"' managed to spot U.S. carriers en route to Japan.

Four N1K2s were shot down and the Corsairs managed to return to their carrier, USS Bunker Hill.

Many other Shidens were destroyed by American fighters over another airfield, where they tried to land because they were low on fuel.

The actual losses were 15 Shidens and 13 pilots, a "Myrt" with its three-man crew, and nine other Japanese fighters.