Harry Gladwyn Harcourt, DSO & Bar, OBE, MC (13 February 1895 – 20 December 1970) was an officer in the British Army and later the Australian Army who commanded an Australian commando unit during the Second World War.Harcourt's military career began in 1914 when he was commissioned into the British Army. During the First World War he served on the Western Front, commanding a machine gun unit. He gained promotion quickly, advancing to the rank of major by the end of the war.