O Barco de Valdeorras is a municipality in the province of Ourense, in the autonomous community of Galicia, Spain. It belongs to the comarca of Valdeorras, serving as its capital. It is located in the Sil valley and lying in the Serra do Eixo. One of its economic foundations, besides mining and slate processing, is wine production, which qualified for the Designation of Origin Valdeorras.