| Amanã River | |
| Pushpin Map: | Brazil |
| River System: | Maués Açu River |
| Source1 Location: | Pará state |
| Mouth Coordinates: | -4.3866°N -57.5841°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
Amanã River is a river of Amazonas and Pará states in north-western Brazil.
The Amanã River flows through the Alto Maués Ecological Station. It joins the Parauari River to form the Maués Açu River.