Ribagorça (Western Catalan: [riβaˈɣɔɾsa]) or Ribagorza (Spanish: [riβaˈɣoɾθa], Aragonese: [ɾiβaˈɣoɾθa]; French: Rives Gorces) is a historical and natural region of Aragon and Catalonia.

The physiography of the Ribagorça natural region includes the Ésera, Isábena and Noguera Ribagorçana river basins with their tributaries.

The region also encompasses the mountain ranges spanning the Pyrenees and Pre-Pyrenees area that surrounds the basins of these south-flowing rivers.

It borders the French département of the Haute-Garonne to the north, the Aran Valley, Alta Ribagorça, Pallars Jussà, and Noguera to the east, Sobrarbe to the west, as well as Somontano de Barbastro and La Litera/La Llitera to the south.

However, Aragonese and Catalan form a dialectal continuum in the region and it is not possible to draw the geographical limit of both languages in a clear-cut manner.