Ostra or Ostrá or Östra or Oštra may refer to the following places:
Czech Republic Ostrá (Nymburk District), a village and municipality in Czech Republic
Italy Ancient Ostra, an ancient Roman city in Italy Ostra, Marche, a town and commune in Italy Ostra Vetere, a town and commune in Italy
Romania Ostra, Suceava, a commune in Romania
Slovakia Ostrá (Veľká Fatra), a mountain in Slovakia