Randal MacDonnell, 4th Earl of Antrim (1680–1721) was an Irish aristocrat.
[1] His parents were Alexander MacDonnell, 3rd Earl of Antrim and Helena Burke.
Through his grandmother Ellis MacDonnell, Countess of Antrim he was descended from her father Hugh O'Neill, Earl of Tyrone and was, therefore, part of the extended O'Neill dynasty which had been the dominant family in Gaelic Ireland until the Flight of the Earls.
Randal's father was a leading Catholic, and supporter of James II in the Williamite War, unsuccessfully leading a force to capture Derry in 1688.
He was thereby regarded by James II's victorious opponent William III to have forfeited the Earldom in 1689.