O Barco de Valdeorras is a municipality in Ourense (province) in the Galicia region of north-west Spain. It lies towards the very north-east of Ourense province. Located in the Sil valley, lying in the Serra do Eixo, is the capital of the Valdeorras region. One of its economic foundations, besides mining and slate processing, is wine production, which qualified for the Designation of Origin Valdeorras. Remains of Roman and pre-Roman culture and several stately manor houses are the most important monuments in the town.