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 10,755 hectares (26,580 acres).

This article related to a river in Minas Gerais is a stub.