The 397th Fighter Squadron is an inactive United States Air Force unit. It was activated in June 1943 as part of the 368th Fighter Group. After training in the United States, it moved to the European Theater of Operations, where it served in combat until the spring of 1945 with Ninth Air Force, earning a Distinguished Unit Citation and a Belgian Fourragère for its actions. Following V-E Day, the squadron served in the army of occupation at AAF Station Straubing, Germany until was inactivated on 20 August 1946.