The Ubaye (French pronunciation: [ybaj]; Occitan: Ubaia) is a river of southeastern France. It is 83 kilometres (52 mi) long and flows through the Alpes-de-Haute-Provence department. Its drainage basin is 1,009 km (390 sq mi).

Its rises at the Col de Longet, in the Cottian Alps on the border with Italy. It flows generally southwest, through Saint-Paul-sur-Ubaye, Jausiers and Barcelonnette. It flows into the Lac de Serre-Ponçon (which is fed and drained by the Durance) near La Bréole.

• Ubaye Valley
• Mercantour National Park