Aude (French: [od]; Occitan: [ˈawðe]) is a department in south-central France named after the river Aude. The local council also calls the department "Cathar Country".

Aude is also a frequent feminine French given name in Francophone countries, deriving initially from Aude or Oda, a wife of Bertrand, Duke of Aquitaine, and mother of Saint Hubertus's brother Eudo. Aude was the name of Roland's fiancée in the chansons de geste.

Aude is located between the Mediterranean Sea and the Pyrenees mountains.

It is part of the current region of Occitanie. It is surrounded by the departments of Pyrénées-Orientales, Ariège, Haute-Garonne, Tarn, and Hérault, with the Golfe du Lion on the east.

The countryside in this department falls into several natural regions:

Each natural region of the Aude has its own particular landscape. In the east, lagoons or coastal lakes form a barrier between land and sea. These were formed by accumulated sediments brought down by the rivers Aude, Orb and Hérault. There are many such lakes of brackish water. This environment is demanding for flora and fauna, as it suffers from the rigours of sea, sun, dryness and floods. Halophile (i.e., salt-loving) plants grow there and it is also noted for animals such as the pink flamingo and white stilt.

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