| Official Name: | Östansjö |
| Pushpin Map: | Sweden Örebro#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Hallsberg Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Örebro County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Närke |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.39 |
| Population As Of: | 31 December 2010 |
| Population Total: | 868 |
| Population Density Km2: | 623 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 59.0444°N 14.9819°W |
Östansjö is a locality situated in Hallsberg Municipality, Örebro County, Sweden with 868 inhabitants in 2010.