William Douglas, 10th Earl of Angus (b. 1552)
William Douglas, 10th Earl of Angus (1554 – 3 March 1611) was a Scottish nobleman. He was the son of William Douglas, 9th Earl of Angus (1533–1591). He was a direct descendant of King James I through his paternal grandmother, Agnes Keith, a daughter of William Keith, 3rd Earl Marischal.