| Langvatnet | |
| Pushpin Map: | Nordland#Norway |
| Pushpin Label Position: | bottom |
| Pushpin Label: | Langvatnet |
| Pushpin Map Caption: | Location of the lake |
| Coordinates: | 66.3708°N 14.0968°W |
| Location: | Rana, Nordland |
| Basin Countries: | Norway |
| Area: | 26.38km2 |
| Reference: | NVE |
Langvatnet is a lake in the municipality of Rana in Nordland county, Norway. The 26.38km2 lake lies just northwest of the town of Mo i Rana. The lake flows out into the river Langvassåga just north of Mo i Rana Airport, Røssvoll. The lake used as a reservoir for the Langvatn hydroelectric power plant in the village of Ytteren, just down the hill from the lake.[1]