Claud Hamilton, 4th Earl of Abercorn PC (Ire) (1659–1691) was a Scottish and Irish peer who fought for the Jacobites in the Williamite War. He went with King James to Derry in 1689 and tried to negotiate the surrender of the town with Adam Murray. He raised a regiment of horse that he led in the defeats of Newtownbutler in 1689 and Aughrim in 1691. He was killed when the ship that should have brought him to France was intercepted by a Dutch privateer.