| Camaiú River | |
| Name Other: | Rio Camaiú |
| Pushpin Map: | Brazil |
| River System: | Sucunduri River |
| Source1 Location: | Amazonas state |
| Mouth Location: | Sucunduri River |
| Mouth Coordinates: | -5.7864°N -59.5877°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
Camaiú River is a tributary of the Sucunduri River in the Amazonas state in north-western Brazil.
The river flows through the Acari National Park created by president Dilma Rousseff in 2016 in the last week before her provisional removal from office.