| Tamanduateí River | |
| Subdivision Type1: | Country |
| Subdivision Type2: | Region |
| Subdivision Name2: | Greater São Paulo, São Paulo state |
| Source1 Location: | Serra do Mar, São Paulo state |
| Mouth Location: | São Paulo city |
| Length: | 35km (22miles) |
| Basin Size: | 320km2 |
The Tamanduateí River (in Portuguese: Rio Tamanduateí, pronounced as /pt/) is a river of São Paulo state in southeastern Brazil.