Vilaller (Western Catalan: [bi.laˈʎe], locally (Ribagorçan) [bi.ɾaˈʎe]) is a town and municipality in Alta Ribagorça county in Catalonia.

In the past Casós, Sarroqueta de Barravés and Viuet belonged to Vilaller.

It is part of the 26th pastoral unit of the archpriest of Ribagorça and is managed by the rector of El Pont de Suert.

The exact location of the benedictine monastery of Sant Andreu de Barravés, of great importance in the history of the valley, remains unknown.

According to Joan Coromines, Vilaller comes from villa Alihari, a hybrid form with first a romance component (town) and second a German one (a proper name).