| Cubatão River | |
| Pushpin Map: | Brazil |
| Source1 Location: | Santa Catarina state |
| Mouth Location: | Atlantic Ocean, Palhoça, Santa Catarina |
| Mouth Coordinates: | -27.6983°N -48.6369°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Tributaries Right: | Vargem do Braço River |
The Cubatão River is a river of Santa Catarina state in southeastern Brazil.
The sources of the river are in the Serra do Tabuleiro State Park, a mountainous region to the south west of Florianópolis covered in lush rain forest.The river supplies water to the greater Florianópolis region.It enters the Atlantic to the south of the suburb of Palhoça.