Ostrobothnia refers to various areas in Finland:
- Ostrobothnia (historical province), a traditional region (landskap) of Finland
- Ostrobothnia County, a county (län) of the Kingdom of Sweden in 1634–1775
- Modern regions (landskap) in Finland:
- Ostrobothnia (administrative region), coastal part of historical Ostrobothnia
- South Ostrobothnia
- Central Ostrobothnia
- North Ostrobothnia