Antoine III Agénor de Gramont, Duke of Gramont, comte de Guiche, comte de Gramont, comte de Louvigny, Souverain de Bidache, (1604, Chateau d'Hagetmau – 12 July 1678, Bayonne) was a French military man and diplomat. Marshal of France from 1641; Viceroy of Navarre and Béarn, and Governor of Bayonne.