The county of Armagnac (; Gascon Armanhac), situated between the Adour and Garonne rivers in the lower foothills of the Pyrenées, is a historic county of the  Duchy of Gascony, established in 601 in Aquitaine (now France). It is a region in southwestern France that includes parts of the Departments of Gers, Landes, and Lot-et-Garonne.