The 339th Fighter Group was a unit of the United States Air Forces during World War II. It comprised the 503rd, 504th, and 505th Fighter Squadrons. The group was an Eighth Air Force fighter unit stationed in England assigned to RAF Fowlmere. It had the highest claims of air and ground enemy aircraft victories in one year, and was the only group to claim over a hundred ground strafing victories on two occasions – 105 on 4 April 1945 and 118 on 16 April 1945. It was inactivated on 18 October 1945.