| Bacajá River | |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Mouth location in Brazil |
| River System: | Xingu River |
| Source1 Location: | Pará state |
| Mouth Coordinates: | -3.5067°N -51.7132°W |
| Basin Size: | 25756.9km2[1] |
| Subdivision Type1: | Country |
| Subdivision Name1: | Brazil |
| Length: | 374km (232miles) |
| Discharge1 Location: | Confluence of Xingu (near mouth) |
| Discharge1 Avg: | 488.72m3/s[2] |
The Bacajá River is a river of Pará state in north-central Brazil. It is a tributary of the Xingu River.
The Bacajá River is a blackwater river. Its basin is in the Xingu–Tocantins–Araguaia moist forests ecoregion.