Agnes of Navarre (French: Agnès d'Évreux, Spanish: Inés de Navarra; 1337 – 4 February 1397) was the daughter of Philip III of Navarre and Joan II of Navarre, and became Countess of Foix on marriage to Gaston III, Count of Foix. She was rumoured to have had an affair with poet Guillaume de Machaut and so inspired his poem Le Voir Dit.