Mark Singleton (1762 – 17 July 1840) was an Anglo-Irish politician. He sat in the House of Commons of Great Britain as an MP for the borough of Eye from 1796 to 1799, in the Irish House of Commons in 1800 as the Member of Parliament (MP) for the rotten borough of Carysfort in County Wicklow, and then in the House of Commons of the United Kingdom as an MP for Eye from 1807 to 1820. Singleton owed his career to the patronage of his father-in-law. After a period as a socialite, Cornwallis's influence secured Singleton's parliamentary seats and his appointment in 1795 as Storekeeper of Ordnance.