Paul-Yves Pezron (1639, Hennebont, – 9 October 1706, Brie) was a seventeenth-century Cistercian brother from Brittany, best known for his 1703 publication of a study on the common origin of the Bretons and the Welsh, Antiquité de la nation, et de langue des celtes. Pezron was a Doctor of Theology at the Cistercian College of St. Bernard in Paris and abbot of La Charmoie.