| Canoas River | |
| Name Other: | Sertão River |
| Source1 Location: | Santa Catarina state |
| Mouth: | Mampituba River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Canoas River, also known as Sertão River, is a river of Santa Catarina state in southeastern Brazil. It is one of two branches formed by the Praia Grande River, which recombine to form the Mampituba.