Castelnaudary is a commune in the Aude department in the Occitanie region of southern France. It is located in the former province of the Lauragais and famous for cassoulet of which it claims to be the world capital, and of which it is a major producer.

Aude is a department in Southern France, located in the Occitanie region and named after the river Aude. The departmental council also calls it "Cathar Country" after a group of religious dissidents active in the 12th to 14th centuries.