| Manso River | |
| Pushpin Map: | Brazil |
| River System: | Cuiabá River |
| Source1 Location: | Mato Grosso |
| Mouth Coordinates: | -14.6972°N -56.2414°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Length: | [1] |
The Manso River (Portuguese: Rio Manso) is a river in the Mato Grosso state of western Brazil. It is a tributary of the Cuiabá River, and is approximately 850 kilometers long.
The river is impounded by the Manso Dam in Rosário Oeste, Mato Grosso, creating a reservoir to power a 92 MW hydroelectric power plant.