| Itaúnas River | |
| Pushpin Map: | Brazil |
| Source1 Location: | Espírito Santo state |
| Mouth Location: | Atlantic Ocean |
| Mouth Coordinates: | -18.5346°N -39.7321°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Itaúnas River (Portuguese: Itaúnas) is a river of Espírito Santo state in eastern Brazil.
The Itaúnas State Park, created in 1991, is named after the Itaúnas River, which runs through the park for .The river approaches the coast at the settlement of Itaúnas and then runs southwest, parallel to the coast behind a sand bar, before entering the Atlantic Ocean to the north of Conceição da Barra.