Charles I de Poitiers, Seigneur de Saint-Vallier

Charles de Poitiers (1330/1331–after 18 March 1410), eighth son of Count Aymar V of Valentinois and Sibylle des Baux, was seigneur of Saint-Vallier. In 1358 his nephew Count Aymar VI enfeoffed him with Saint-Vallier.

When his brother Henri, bishop of Troyes, died in 1370, Charles claimed to be the natural heir to Valentinois and long disputed the county with his nephew Louis II. By his wife Simone de Méry he founded the Saint-Vallier line from which Diane de Poitiers later descended; his son Louis succeeded him in 1410.