Lieutenant General Sir Alwyn Ragnar Garrett, KBE, CB (12 February 1900 – 4 November 1977) was a senior commander in the Australian Army. He served as Chief of the General Staff from 1958 to 1960. Born in Western Australia, Garrett graduated from the Royal Military College, Duntroon, in 1921. He was adjutant and quartermaster in several regiments of the Australian Light Horse before undertaking a staff course in England, which he completed just as the Second World War broke out.