| O Barco de Valdeorras | |
| Translit Lang1 Type: | Spanish |
| Translit Lang1 Info: | O Barco de Valdeorras |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Coordinates: | 42.4167°N -6.9831°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous Community |
| Subdivision Type2: | Province |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Valdeorras |
| Leader Party: | PSOE |
| Leader Title: | Mayor |
| Leader Name: | Alfredo Laudelino García Rodríguez |
| Area Total Km2: | 86 |
| Elevation Footnotes: | (AMSL) |
| Elevation M: | 325 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST (GMT +2) |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 32300 |
| Area Code: | +34 (Spain) + 988 (Ourense) |
| Website: | www.concellodobarco.org |
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. Remains of Roman and pre-Roman culture and several stately manor houses are the most important monuments in the town. It is also famous for its wines.
In some caves of the Sierra de la Lastra early human remains were found. In other places close to O Barco, Castreño petroglyphs and settlements have been discovered. The Gegurros, one of the 22 villages that were part of Asturican convent, were the ancient inhabitants of this land and the adjective derived from the current name of the region (Val-de-giorres).
Romanization was intense in a strategic area rich in minerals. Among the Médulas and Montefurado are frequent traces of gold mining activity. By passing the Via Nova (XVIII of the Antonine Itinerary) that joined Braga and Astorga, and other secondary platforms, forced the people of these areas to build bridges that are a testament of that time.
In the Middle Ages, the Lordship of Valdeorras was administered by the nobility.