| Umari River | |
| Pushpin Map: | Brazil |
| River System: | Purus River. |
| Source1 Location: | Amazonas state |
| Mouth Location: | Purus River |
| Mouth Coordinates: | -7.0763°N -64.5721°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
The Umari River is a river of Amazonas state in north-western Brazil, a tributary of the Purus River.
The river flows through the Mapinguari National Park, a conservation unit created in 2008.