| Balu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Vâlcea County |
| Length: | 9km (06miles) |
| Mouth: | Lotru |
| Mouth Location: | Vidra Lake |
| Mouth Coordinates: | 45.4324°N 23.6976°W |
| Basin Size: | 14km2 |
The Balu is a left tributary of the river Lotru in Romania. It discharges into Vidra Lake, which is drained by the Lotru.[1] Its length is 9km (06miles) and its basin size 14km2.[2]