Pessac is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France. It is a member of the metropolis of Bordeaux, being the second-largest suburb of Bordeaux and located just southwest of it. Pessac is also home to Bordeaux Montaigne University and the Institut d'études politiques de Bordeaux.

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.