Einion ab Owain (died c. 984) was a medieval Welsh prince of the House of Dinefwr. He was the eldest son and probable edling of King Owain of Dyfed, son of Hywel Dda. The Chronicle of the Princes records Einion assisting King Iago of Gwynedd in driving the Irish and their Danish allies from Wales in 966. Einion then raided Gower again the next year, "on the pretense" of opposing the pagan Vikings and their supporters. This prompted a retaliatory raid by King of Morgannwg, who brought Gower back under his control, and an invasion by King Edgar of England, who forced Einion's father Owain to swear fealty to him at Caerleon upon Usk. A third raid in 976 went little better: Einion is recorded devastating the area so thoroughly it provoked famine but Owain ap Morgan's brother Ithel defeated hi