Richard Colley Wesley, 1st Baron Mornington (c. 1690 – 31 January 1758) was an Irish peer, best remembered as the grandfather of Arthur Wellesley, 1st Duke of Wellington.

[1] On 23 September 1728 Colley inherited the estates of Dangan and Mornington, in County Meath, on the death of his cousin, Garret Wesley.

[1] He was High Sheriff of Meath in 1734 and he was created Baron Mornington in the Peerage of Ireland on 9 July 1746.

[4] The diarist Mary Delany (who was Garret's godmother) visiting Dangan in 1748 after a 17-year gap, found him "the same good-humoured, agreeable man he was on my last visit", and praised him as the man with most merits and fewest faults of anyone she knew, valuing wealth only as a means to make others happy.

He was proud of, and fostered, his son's musical talent, but he was also extravagant, and died in debt, beginning the cycle of family indebtedness which eventually led to his eldest grandson Richard selling Dangan 40 years later.