| Badajós River | |
| Source1 Location: | Amazonas state |
| Subdivision Type1: | Country |
| Length Km: | 413 |
| Source1 Coordinates: | -3.2007°N -63.7926°W |
| Mouth Coordinates: | -3.7464°N -62.277°W |
| Discharge1 Location: | Confluencia of Solimões, Amazonas |
| Discharge1 Avg: | 1700m3/s[1] |
| Basin Size Km2: | 21,740 |
| Basin Size Ref: | [2] |
| Tributaries Left: | Cunauaru |
Badajós River is a river of Amazonas state in north-western Brazil.