Pohjanmaa (, ) may refer to:
Regions
Pohjanmaa or Ostrobothnia (historical province), a traditional region () in Finland Pohjanmaan lääni or Ostrobothnia County, a county of Sweden from 1634 to 1775 Modern regions: Pohjanmaan maakunta or Ostrobothnia (administrative region), a region of Finland Pohjois-Pohjanmaan maakunta or North Ostrobothnia, a region of Finland Etelä-Pohjanmaan maakunta or South Ostrobothnia, a region of Finland Keski-Pohjanmaan maakunta or Central Ostrobothnia, a region of Finland
Ships Pohjanmaa or Pojama, a type of Swedish warship in the late 18th and early 19th centuries Finnish minelayer Pohjanmaa, a former flagship of the Finnish Navy Pohjanmaa-class corvette, an upcoming surface combatant class of the Finnish Navy
See also Ostrobothnia (disambiguation)