Brigadier Archibald Robert Allen, ED (20 October 1888 – September 1961) was a senior Australian Army officer in the Second World War.
Allen is believed to have enlisted in the First World War on 16 September 1914 and was assigned to H Company in the 16th Battalion (according to the AIF Project website).Between the wars Allen was the Commanding Officer 43rd/48th Infantry Battalion.During the Second World War Allen was Commanding Officer of the 3rd Infantry Brigade (1936–1942), and Commandant of the Western Reinforcement Training Centre (1944).