William Adair

General Sir William Thompson Adair (21 June 1850 – 29 December 1931) was a Royal Marines officer and Ulster Unionist.

Biography Adair was born into a distinguished military family, the son of Sir Charles Adair and Isabella Aslett, daughter of Col. Thompson Aslett of the Royal Marines. His three brothers were Sir Charles Henry Adair, Rear-Admiral T. B. S. Adair, and Brig.-Gen. Hugh Robert Adair. He received the brevet rank of colonel on 7 February 1900, and was appointed Assistant Adjutant General on 1 November 1900. Following his return to the United Kingdom, he was promoted colonel second commandant of the Royal Marine Light Infantry on 30 January 1902. He became Deputy Adjutant-General Royal Marines (the professional head of the Royal Marines) June 1907 before retiring in June 1911.