| São Pedro River | |
| Pushpin Map: | Brazil |
| River System: | Guandu River |
| Source1 Location: | Rio de Janeiro state |
| Mouth Location: | Nova Belem, Japeri, Rio de Janeiro |
| Mouth Coordinates: | -22.6603°N -43.6332°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The São Pedro River is a river of Rio de Janeiro state in southeastern Brazil. It is a tributary of the Guandu River.
The Jaceruba Environmental Protection Area in the municipality of Nova Iguaçu was created in 2002 with objectives that included protection and preservation of the forests, springs and headwaters of the São Pedro River basin.