| Guaraú River | |
| Pushpin Map: | Brazil |
| Mouth Location: | Atlantic Ocean |
| Mouth Coordinates: | -24.3793°N -47.0191°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Guaraú River (Portuguese: Rio Guaraú) is a river in the state of São Paulo, Brazil.
The basin of the Guaraú River is in the Juréia-Itatins Ecological Station.The river flows eastward along the foot of the Serra dos Itatins and enters the Atlantic Ocean to the west of Peruíbe.It separates the Itinguçu State Park to the south from the Balneário Garça Vermelha to the north.The state park was created in 2006 to support ecotourism.