| Acari River | |
| Pushpin Map: | Brazil |
| Source1 Location: | Amazonas state |
| Mouth Coordinates: | -5.2822°N -59.6816°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
Acari River (Portuguese: Rio Acari) is a river of 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.It defines the eastern boundary of the Juma Sustainable Development Reserve, created in 2006.It joins the Sucunduri River from the left, and the downstream section is known as the Canumã River.