Air Vice Marshal William Dowling (Bill) Bostock CB, DSO, OBE (5 February 1892 – 28 April 1968) was a senior commander in the Royal Australian Air Force (RAAF). During World War II he led RAAF Command, the Air Force's main operational formation, with responsibility for the defence of Australia and air offensives against Japanese targets in the South West Pacific Area. His achievements in the role earned him the Distinguished Service Order and the American Medal of Freedom. General Douglas MacArthur described him as "one of the world's most successful airmen".