The Roncal Valley (Standard Basque: Erronkaribar, Spanish: Valle de Roncal) is a valley and mancomunidad in the very east of Navarre, bordering the autonomous community of Aragon to the East and France to the north. It is part of the Merindad of Sangüesa. The Ezka River, a tributary of the Aragón, flows from north to south through the center of the valley.

The Roncalese dialect of Basque was historically spoken within this valley. It shares its name with the town and municipality of Roncal. While the last speakers of the valley's traditional dialect have died, the valley is located in Navarre's mixed language zone and does have a number of Basque speakers.