Air Vice-Marshal Michael John O'Brian, (Urdu: ????? ?? ??????; born: 5 January 1928 – 10 March 2002), was an air officer in the Pakistan Air Force (PAF) who served as the Commandant of National Defence University, Islamabad.
O'Brian was the first Pakistan Air Force officer to serve as the Commandant of the university.
He also served as the Deputy Chief of Air Staff, and was one of the distinguished Christian pilots who participated in Indo-Pakistan wars of 1947, 1965, and the 1971.