| Preto River | |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Mouth location in Brazil |
| River System: | Araçuaí River |
| Source1 Location: | Rio Preto State Park |
| Mouth Coordinates: | -17.8527°N -43.2348°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Preto River (Portuguese: Rio Preto: Black River) is a river in the state of Minas Gerais, Brazil. It is a tributary of the Araçuaí River.
The Rio Preto was declared a "permanently protected river" in 1991 in response to demand from the local community.The Rio Preto State Park, which protects the river's sources, was created by decree 35.611 of 1 June 1994, with an area of .