| Official Name: | Alster |
| Pushpin Map: | Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Karlstad Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Värmland County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Värmland |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.84 |
| Population As Of: | 31 December 2010 |
| Population Total: | 586 |
| Population Density Km2: | 699 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 59.4°N 50°W |
Alster is a locality situated in Karlstad Municipality, Värmland County, Sweden with 586 inhabitants in 2010. Alster is the birthplace of poet Gustaf Fröding.