Morfudd ferch Urien is a figure of Welsh Arthurian legend. She is the daughter of Urien Rheged by Modron, and twin sister to Owain. Morfudd appears in the Welsh Triads and is also referred to in Culhwch and Olwen. The enduring love between her and Cynon son of Clydno, one of Arthur's warriors, is remarked on in several of the Triads, pointing to a now-lost popular tradition.