| Coari River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Subdivision Type2: | State |
| Subdivision Name2: | Amazonas |
| Length: | 530km (330miles)[1] |
| Discharge1 Location: | Coari (near mouth) |
| Discharge1 Avg: | 1850m3/s[2] |
| Source1 Location: | Amazonas |
| Source1 Coordinates: | -5.4068°N -65.7566°W |
| Mouth: | Solimões |
| Mouth Location: | Coari, Amazonas |
| Mouth Coordinates: | -4.0763°N -63.136°W |
| River System: | Solimões |
| Basin Size: | [3] |
| Tributaries Left: | Itanhauã, Muã, Urucu, Aruã |
Coari River is a tributary of the Amazon River (Solimões section) in the Amazonas state in north-western Brazil.