Langon is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France. Langon serves as the seat of its district, canton and subprefecture. Its inhabitants are called Langonnais and Langonnaise.

Gironde is the largest department in the Nouvelle-Aquitaine region of Southwestern France. Named after the Gironde estuary, a major waterway, its prefecture is Bordeaux. In 2019, it had a population of 1,623,749. The famous Bordeaux wine region is in Gironde. It has six arrondissements, making it one of the departments with the most arrondissements.