Fergus of Galloway was a twelfth-century Lord of Galloway. Although his familial origins are unknown, it is possible that he was of Norse–Gaelic ancestry. Fergus first appears on record in 1136, when he witnessed a charter of David I, King of Scotland. There is considerable evidence indicating that Fergus was married to an illegitimate daughter of Henry I, King of England. It is possible that Elizabeth Fitzroy was the mother of Fergus's three children.