| Biá River | |
| Pushpin Map: | Brazil |
| River System: | Jutaí River |
| Source1 Location: | State of Amazonas |
| Mouth Location: | Jutaí River |
| Mouth Coordinates: | -3.8837°N -67.5335°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Length: | 470 |
The Biá River (Portuguese: Rio Biá) is a river of Amazonas state in north-western Brazil. It is a tributary of the Jutaí River.
The Cujubim Sustainable Development Reserve, established in 2003, lies on either side of the river in the municipality of Jutaí.It is the largest conservation unit in Amazonas and the largest sustainable development reserve in the world.