Walter Oswald Watt OBE (11 February 1878 21 May 1921) was an Australian aviator and businessman. Born in England, he moved to Sydney with his family when he was a year old, returning at the age of eleven for education at Bristol and Cambridge. He went back to Australia in 1900 and enlisted in the Militia before setting up as a grazier in New South Wales and Queensland. Learning to fly in 1911, Watt joined the French Foreign Legion as a pilot upon the outbreak of World War I. He transferred to the Australian Flying Corps (AFC) in 1916, quickly progressing from flight commander with No. 1 Squadron in Egypt, to Commanding Officer of No. 2 Squadron on the Western Front. By February 1918, he had been promoted to Lieutenant Colonel and taken command of the AFC's 1st Training Wing in England.