Henry John 'Harry' Butler AFC (9 November 1889 – 30 July 1924) was a pioneer Australian aviator, Captain and Chief Flight Instructor in the Royal Flying Corps during World War I.
When he flew an air mail run from Adelaide across Gulf St Vincent to Minlaton on 6 August 1919, it was the first over-water flight in the Southern Hemisphere carrying air mail and the first flight over a major body of water in the southern hemisphere.