The Arize is a river of France, a right affluent of the Garonne. It arises at 1,355 in the massif of Arize, in the Pyrenees, in the department of Ariège. Its length is 67 km. It flows into the Garonne at Carbonne.
In its first four or five kilometers it is called the Péguère. It formed the grotto of Le Mas-d'Azil.