| Acarai River | |
| Pushpin Map: | Brazil |
| River System: | Xingu River |
| Source1 Location: | Pará state |
| Mouth Location: | Xingu River |
| Mouth Coordinates: | -2.0368°N -52.2703°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Acarai River is a river of Pará state in north-central Brazil, a tributary of the Xingu River.
The river runs through the Verde para Sempre Extractive Reserve, a sustainable use conservation unit created in 2004, before discharging into the Xingu.