| Måna | |
| Name Other: | Måne |
| Map: | Mosvatn.PNG |
| Pushpin Map: | Telemark#Norway |
| Pushpin Map Caption: | Location of the river |
| Subdivision Type1: | Country |
| Subdivision Name1: | Norway |
| Subdivision Type2: | County |
| Subdivision Name2: | Telemark |
| Subdivision Type3: | Municipalities |
| Subdivision Name3: | Tinn Municipality |
| Length: | 32km (20miles) |
| Source1: | Møsvatn |
| Source1 Location: | Tinn-Vinje border |
| Source1 Coordinates: | 59.824°N 8.3181°W |
| Mouth: | Tinnsjå |
| Mouth Location: | Miland, Tinn |
| Mouth Coordinates: | 59.9278°N 8.7993°W |
The Måna or Måne is a river in Tinn Municipality in Telemark county, Norway. The 32km (20miles) river flows from the lake Møsvatn through the Vestfjorddalen valley and the town of Rjukan to the large lake Tinnsjå near the village of Miland. It is part of the Skiensvassdraget drainage basin.
The entire river has a total drop in elevation of from Møsvatn to Tinnsjå, notably including the Rjukan Falls, a large waterfall that has also been a major tourist attraction. This area has been developed in five power stations with a total installation of and a total average annual production of 2237GWh. The largest power stations are Vemork and Såheim.[1]