William IV, Lord of Douglas

William, Lord of Douglas, was a son of the Black Douglas, James, and inherited the Douglas lands as a child after his father was killed in Spain in 1330. His uncle, Sir Archibald Douglas, guarded his inheritance.

In 1333 he followed the Guardian to the relief of Berwick and was slain beside him at the Battle of Halidon Hill on 19 July. He died unmarried and still under age.