Ostrobothnia, In Swedish Österbotten (literally "East (of) Bottom / the Gulf of Bothnia") or Pohjanmaa in Finnish (literally "Bottom land / soil / ground"), is a historical province to the north in Finland. It borders on Karelia, Savonia, Tavastia and Satakunda in the south, and on Västerbotten in Sweden, and Laponia in the north. It is also bounded by Russia in the east and the Gulf of Bothnia in the west.

Ostrobothnia is one of Finland's 20 regions (fi: maakunta/sv: landskap). It is located in Central Finland. It borders to the regions Central Ostrobothnia, Southern Ostrobothnia, and Satakunta.