No. 5 Squadron was a Royal Australian Air Force training, army co-operation and helicopter squadron. The squadron was first formed in 1917 as a training squadron of the Australian Flying Corps in Britain, training pilots to serve on the Western Front. It was later formed as a naval fleet co-operation squadron, but was later redesignated as No. 9 Squadron RAAF before being re-formed and re-roled as an army co-operation squadron during World War II.