| Passa Una River | |
| Source1 Location: | Paraná state |
| Mouth: | Iguazu River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Passa Una River is a river of Paraná state in southern Brazil. Arising in the state capital Curitiba, it flows along the border with Campo Largo and flows into the Iguazu River in the municipality of Araucária.