| Băcâia | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Hunedoara County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Băcâia, Bozeș |
| Length: | 11km (07miles) |
| Mouth: | Geoagiu |
| Mouth Location: | Bozeș |
| Mouth Coordinates: | 45.9643°N 23.1687°W |
| Progression: | Geoagiu→ |
| Basin Size: | 100km2 |
| Tributaries Right: | Cib, Ardeu |
The Băcâia (Hungarian: Bakonya) is a left tributary of the river Geoagiu in Romania which flows into the Geoagiu in Bozeș. Its length is 11km (07miles) and its basin size is 100km2.