| Cachorro River | |
| Pushpin Map: | Brazil |
| River System: | Trombetas River |
| Source1 Location: | Pará state |
| Mouth Location: | Trombetas River |
| Mouth Coordinates: | -0.9992°N -57.0522°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Cachorro River is a tributary of the Trombetas River in Pará state in north-central Brazil.
The Cachorro River flows through the Trombetas State Forest from north to south, and joins the Trombetas within the forest.