Alexander Randal Mark McDonnell, 9th Earl of Antrim, FRSA (3 February 1935 – 21 July 2021), known as Alexander Dunluce, was a Northern Irish landowner, peer, artist, and art restorer. He lived mostly at his ancestral home, Glenarm Castle, County Antrim, Northern Ireland. As his titles were in the peerage of Ireland, he did not sit in the House of Lords. The son of the 8th Earl of Antrim (1911–1977) and his artist wife Angela Sykes (1911–1984), as the heir apparent to his father's titles he was styled Viscount Dunluce from his birth until 1977.