Beli ap Rhun (c. 517 – c. 599) was King of Gwynedd (reigned c. 586 – c. 599). Nothing is known of the person, and his name is known only from Welsh genealogies, which confirm that he had at least two sons. He succeeded his father Rhun ap Maelgwn as king, and was in turn succeeded by his son Iago. Beli was either the father or grandfather of Saint Edeyrn.