Ludwin (also called "Liutwin") (? - 717) was the Bishop of Rheims from 691 until 717, and the Bishop of Trier from 697 until 717. Ludwin was a Frankish noble of the Widoner. He did not have the intention to enter the church; he married a noblewoman of the Robertiners and had two sons, Milo and Wido. His uncle, Basinus, was the bishop of Trier.