| Langvatnet | |
| Pushpin Map: | Nordland#Norway |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location of the lake |
| Coordinates: | 67.1376°N 16.024°W |
| Location: | Fauske, Nordland |
| Type: | glacier lake and dammed reservoir |
| Basin Countries: | Norway |
| Length: | 10.3km (06.4miles) |
| Width: | 0.7km (00.4miles) |
| Area: | 5.46km2 |
| Max-Depth: | 93m (305feet) |
| Shore: | 25.82km (16.04miles) |
| Elevation: | 127m (417feet) |
| Reference: | NVE |
Langvatnet (English: Long Lake)[1] is a lake that lies in Fauske Municipality in Nordland county, Norway. The 5.46km2 lake lies about east of the town of Fauske. The village of Sulitjelma lies on the northeastern edge of the lake. Water from the lakes Kjelvatnet and Låmivatnet flow into the lake from the south and east. The water from Langvatnet flows out through the Sjønstå River to the west towards the lake Øvrevatnet.[2]