| Valea Lacului | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Bihor County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Petreu |
| Length: | 11km (07miles) |
| Mouth: | Barcău |
| Mouth Location: | Petreu |
| Mouth Coordinates: | 47.3199°N 22.2912°W |
| Basin Size: | 22km2 |
The Valea Lacului is a right tributary of the river Barcău in Romania. It discharges into the Barcău in Petreu. Its length is 11km (07miles) and its basin size is 22km2.