The 511th Bombardment Squadron is an inactive United States Air Force unit. It was last assigned to the 351st Bombardment Group at Fairfax Field, Kansas, where it was inactivated on 27 June 1949. The squadron was first activated during World War II, as a Boeing B-17 Flying Fortress heavy bomber unit. After training in the United states, it deployed to the European Theater of Operations, where it participated in the strategic bombing campaign against Germany. It earned two Distinguished Unit Citations for its combat actions. Following V-E Day, the squadron returned to the United States, where it was inactivated in August 1945. It was activated in the reserves in 1947, but does not appear to have been fully manned or equipped.