Aire-sur-l'Adour (French: [ɛːʁ syʁ laduʁ]; Occitan: Aira d'Ador or simply Aira, before 1962: Aire) is a commune in the Landes department, Nouvelle-Aquitaine, southwestern France.
It lies on the river Adour in the wine area of southwest France. It is an episcopal see of the Diocese of Aire and Dax. The nearest large towns are Mont-de-Marsan to the north and Pau to the south.