| Rio Negro | |
| Source1 Location: | Santa Catarina state |
| Mouth: | Iguazu River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
Rio Negro (Portuguese for "black river") is a river on the border between Paraná and Santa Catarina states in southeastern Brazil. It is part of the Paraná River basin, and a tributary of the Iguazu River.