Air Marshal Sir Peter Roy Maxwell Drummond KCB, DSO & Bar, OBE, MC (2 June 1894 – 27 March 1945) was an Australian-born senior commander in the Royal Air Force (RAF). He rose from private soldier in World War I to air marshal in World War II. Drummond enlisted in the Australian Imperial Force in 1914 and saw action during the Gallipoli campaign the following year. He joined the Royal Flying Corps in 1916 and became a fighter ace in the Middle Eastern theatre. Transferring to the RAF on its formation in 1918, he remained in the British armed forces for the rest of his life.