Pohjanmaa is the name of a geographical region in Finland which can refer to:
- Ostrobothnia, or Pohjanmaa/Österbotten - a Historical province of Sweden
- Oulu, or Oulun lääni/Uleåborgs län - a current Province of Finland
- Western Finland, or Länsi-Suomen lääni/Västra Finlands län - a current Province of Finland
- Northern Ostrobothnia, or Pohjois-Pohjanmaa/Norra Österbotten - a current Region of Finland
- Southern Ostrobothnia, or Etelä-Pohjanmaa/Södra Österbotten - a current Region of Finland
- Ostrobothnia, or Pohjanmaa/Österbotten - a current Region of Finland
- Central Ostrobothnia, or Keski-Pohjanmaa/Mellersta Österbotten - a current Region of Finland