The Gave d'Oloron (French pronunciation: [ɡav dɔlɔʁɔ̃]) is a river of south-western France near the border with Spain. It takes its name from the city Oloron-Sainte-Marie, where it is formed from the rivers Gave d'Aspe and Gave d'Ossau. It joins the Gave de Pau in Peyrehorade to form the Gaves réunis, a tributary of the Adour. The Gave d'Oloron is used for fishing. The river is 148 kilometres (92 mi) long, including its source rivers Gave d'Ossau and Gave du Brousset. Near Sauveterre-de-Béarn it takes up its largest tributary, the Saison.

The Gave d'Oloron flows through the following départements and towns:

• Pyrénées-Atlantiques: Oloron-Sainte-Marie, Sauveterre-de-Béarn.
• Landes: Peyrehorade.