| Official Name: | Österforse |
| Pushpin Map: | Sweden Västernorrland#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Sollefteå Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Västernorrland County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ångermanland |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.90 |
| Population As Of: | 31 December 2010 |
| Population Total: | 204 |
| Population Density Km2: | 227 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 63.15°N 18°W |
Österforse is a locality situated in Sollefteå Municipality, Västernorrland County, Sweden with 204 inhabitants in 2010.
Österforse has a borderline continental/subarctic climate that is quite moderate in nature considering its inland position and latitude. Summer days are very warm for North Central Sweden, being heavily affected by its low elevation in comparison to areas further west such as Östersund. Temperatures are heavily dependent on wind direction and the convergences of warm southerly and cold northerly air. As a result, cold snaps can be quite extreme, resulting in an all-time low of -43C. The all-time heat record is from July 2, 2015 with 32.8C in an otherwise chilly summer.[2]