The Orbieu is an 84.2 km long river in the Aude département, in south central France. Its source is at Fourtou, in the Corbières Massif. It flows generally northeast. It is a right tributary of the Aude into which it flows between Raissac-d'Aude and Marcorignan, 10 km northwest of Narbonne.

Communes along its course

This list is ordered from source to mouth: Fourtou, Auriac, Lanet, Montjoi, Vignevieille, Mayronnes, Saint-Martin-des-Puits, Saint-Pierre-des-Champs, Lagrasse, Ribaute, Camplong-d'Aude, Fabrezan, Ferrals-les-Corbières, Lézignan-Corbières, Luc-sur-Orbieu, Cruscades, Ornaisons, Névian, Villedaigne, Raissac-d'Aude, Marcorignan