The 306th Air Refueling Squadron is an inactive United States Air Force unit. It was last assigned to the 457th Operations Group at Altus Air Force Base, Oklahoma, where it was inactivated on 1 August 1994. The squadron's first predecessor is the 606th Bombardment Squadron, which was activated as a heavy bomber training unit during World War II. It was disbanded in 1944 when the Army Air Forces reorganized its training and support units in the United States to make more effective use of manpower.