Earl Annesley, of Castlewellan in the County of Down, is a title in the Peerage of Ireland. It was created on 17 August 1789 for Francis Annesley, 2nd Viscount Glerawly, with special remainder to his younger brother the Honourable Richard Annesley. He had previously represented Downpatrick in the Irish House of Commons. The titles of Baron Annesley, of Castlewellan in the County of Down, and Viscount Glerawly, in the County of Fermanagh, were created in the Peerage of Ireland on 20 September 1758 and 14 November 1766 respectively for his father William Annesley, who sat as Member of the Irish Parliament for Midleton. Annesley was the sixth son of the Honourable Francis Annesley, fourth son of Francis Annesley, 1st Viscount Valentia.