Air Marshal Selwyn David Evans AC, DSO, AFC (3 June 1925 – 2 September 2020) was a senior commander of the Royal Australian Air Force (RAAF), and a writer and consultant on defence matters. He served as Chief of the Air Staff from 1982 until 1985. After leaving the RAAF he published two military treatises, A Fatal Rivalry: Australia's Defence at Risk and War: A Matter of Principles, as well as an autobiography.