| Mjåvatnet | |
| Pushpin Map: | Nordland#Norway |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location of the lake |
| Coordinates: | 65.9507°N 13.4279°W |
| Location: | Vefsn, Nordland |
| Basin Countries: | Norway |
| Area: | 2.61km2 |
| Reference: | NVE |
Mjåvatnet is a lake that lies in the municipality of Vefsn in Nordland county, Norway. The long, skinny, 2.61km2 lake lies between the lakes Ømmervatnet and Fustvatnet, about northeast of the town of Mosjøen. The European route E6 highway passes along the west coast of the lake.[1]