| Río Negro | |
| Source1 Location: | Coastal Precordillera |
| Subdivision Type1: | Country |
| Subdivision Name1: | Chile |
| Mouth Location: | Rahue River, Chile |
| Mouth Elevation: | 26m (85feet) |
| Mouth Coordinates: | -40.6283°N -73.1878°W |
The Río Negro (Spanish for "black river") is one of the principal tributaries of the Rahue River in southern Chile. It runs from south to north draining part of the eastern slopes of Cordillera Pelada. The commune of Río Negro derives its name from the river.