The Viscounty, later Principality of Béarn, was a medieval lordship in the far south of France, part of the Duchy of Gascony from the late ninth century. In 1347, the viscount declared Béarn an independent principality without feudal obligations. It later entered a personal union with the Kingdom of Navarre in 1479 and with France in 1589. In 1620, the prince formally incorporated Béarn as a province of France.

Béarn is one of the traditional provinces of France, located in the Pyrenees mountains and in the plain at their feet, in Southwestern France. Along with the three Basque provinces of Soule, Lower Navarre and Labourd, the Principality of Bidache, as well as small parts of Gascony, it forms the current Pyrénées-Atlantiques department. The capitals of Béarn were successively Beneharnum, Morlaàs, Orthez and then Pau.