| Preto River | |
| River System: | Itaúnas River |
| Source1 Location: | Espírito Santo state |
| Mouth: | Itaúnas River |
| Mouth Coordinates: | -18.3796°N -39.794°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Preto River is a river of Espírito Santo state in eastern Brazil.The river flows through the Rio Preto National Forest. It is a tributary of the Itaúnas River.