The Ossau Valley (fr|Vallée d'Ossau| pronounced as /fr/; oc-gascon|Aussau / Occitan (post 1500);: la vath d'Aussau) is a valley of the French Pyrénées, in the Pyrénées-Atlantiques département.
18 communes belong to the Valley: Arudy, Aste-Béon, Béost, Bescat, Bielle, Bilhères, Buzy, Castet, Eaux-Bonnes, Gère-Bélesten, Izeste, Laruns, Louvie-Juzon, Louvie-Soubiron, Lys, Rébénacq, Sainte-Colome and Sévignacq-Meyracq.