Richard Colley Wellesley, 1st Marquess Wellesley, KG, KP, PC, PC (Ire) (20 June 1760 – 26 September 1842) was an Anglo-Irish politician and colonial administrator. He was styled as Viscount Wellesley until 1781, when he succeeded his father as 2nd Earl of Mornington. In 1799, he was granted the Irish peerage title of Marquess Wellesley. He was the eldest son of The 1st Earl of Mornington, an Irish peer, and Anne, the eldest daughter of The 1st Viscount Dungannon. His younger brother, Arthur, was Field Marshal The 1st Duke of Wellington.