Donagh [Donough] MacCarthy, 1st Earl of Clancarty, 2nd Viscount Muskerry (died August 1665) was an Irish noble. He sat in the Irish House of Commons in the Irish Parliaments of 1634 and 1639 as member for County Cork. He married Ellen (Eleanor) Butler (died April 1682), who was the sister of James Butler, 1st Duke of Ormonde. The Earl served as a Munster general during the Irish Confederate Wars. He was one of the ten named in Act for the Settlement of Ireland 1652 as leaders of the Royalist forces in Ireland.