| Official Name: | Undersåker |
| Pushpin Map: | Sweden Jämtland#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Åre Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Jämtland County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Jämtland |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.81 |
| Population As Of: | 31 December 2010 |
| Population Total: | 438 |
| Population Density Km2: | 543 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 63.3153°N 13.2506°W |
Undersåker is a locality situated in Åre Municipality, Jämtland County, Sweden with 438 inhabitants in 2010. Edsåsdalen lies within the Undersåker locality approximately from the railway station.