William Nairn (1767 – 8 June 1853) was an English-born army officer and farmer in the Swan River Colony (now Western Australia). Born in England, Nairn was commissioned in the 46th (South Devonshire) Regiment of Foot on 12 May 1800, promoted to captain on 29 June 1809 and major on 30 August 1827. In early 1814 he was sent to Hobart Town in charge of a company. In 1818 Nairn sailed with his detachment for India.After retiring from the army, he eventually settled in the Swan River Colony in 1833.