Archibald the Grim also known as Blak (Black) Archibald (c. 1328–1400), 3rd Earl of Douglas, Earl of Wigtown, Lord of Douglas, Lord of Bothwell and Lord of Galloway was a late medieval Scottish magnate. Archibald the Grim was a bastard son by an unknown mother of Sir James "the Black" Douglas, Robert I's trusted lieutenant. A first cousin of William Douglas, 1st Earl of Douglas, he inherited the earldom of Douglas and its entailed estates as the third earl following the death without legitimate issue of James 2nd Earl of Douglas at the Battle of Otterburn.