Llers Castle (cat. El Castell de Llers) is a fortress in the municipality of Llers (Alt Empordà) declared a cultural asset of national interest.
In the Middle Ages, Llers was a border place between the counties of Besalú and Empuries. It was a strategic point since ancient times, and this strategic importance is one of the probable reasons for the construction of the castle in this area. Llers Cas