| Official Name: | Ostvik |
| Pushpin Map: | Sweden Västerbotten#Sweden |
| Subdivision Type: | Country |
| Subdivision Name: | Sweden |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Skellefteå Municipality |
| Subdivision Type2: | County |
| Subdivision Name2: | Västerbotten County |
| Subdivision Type1: | Province |
| Subdivision Name1: | Västerbotten |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.73 |
| Population As Of: | 31 December 2010 |
| Population Total: | 387 |
| Population Density Km2: | 528 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 64.8833°N 25°W |
Ostvik is a locality situated in Skellefteå Municipality, Västerbotten County, Sweden with 387 inhabitants in 2010.
Ostvik has had a substantial amount of secret military installations for its size, everything from secret underground bunkers to different kind of radar stations. Today there is almost nothing left, but the memories still live on among the older residents.