Labourd (French pronunciation: [labuʁ]; Basque: Lapurdi; Latin: Lapurdum; Gascon: Labord) is a former French province and part of the present-day Pyrénées Atlantiques département of Nouvelle-Aquitaine region. It is one of the traditional Basque provinces, and identified as one of the territorial component parts of the Basque Country by many, especially by the Basque nationalists.
Labourd extends from the Pyrenees to the river Adour, along the Bay of Biscay. To the south are Gipuzkoa and Navarre in Spain, to the east is Lower Navarre, and to the north are the Landes. It has an area of almost 900 km (347 sq mi) and a population of over 200,000 (115,154 in 1901; 209,913 in 1990), making it the most populous of the three French Basque provinces. Over 25% of the inhabitants speak Basque (17% in the Bayonne-Anglet-Biarritz zone, 43% in the rest). Labourd has also long had a Gascon-speaking tradition, notably along the banks of the river Adour but also more diffusely throughout the whole viscounty (about 20% in Bayonne-Anglet-Biarritz).