Louis I de Poitiers, Count of Valentinois

Louis I de Poitiers (died 21 October 1345), son of Count Aymar V of Valentinois and Sibylle des Baux, succeeded his father as count of Valentinois in 1339. In the 1345 Gascon campaign he led seven thousand French troops and besieged the English garrison of Auberoche.

On 21 October Henry of Grosmont surprised his camp at supper and routed the French army; Louis died of his wounds. By his wife Marguerite de Vergy he left a son, Aymar VI, and a daughter, Marguerite.