Demir Hisar
Demir Hisar can refer to:

 Demir Hisar (region), a geographical region in the Republic of Macedonia
 Demir Hisar (town), a town in North Macedonia
 Demir Hisar Municipality, a municipality in North Macedonia
 Demirhisar, former Turkish name of Sidirokastro, a town in Greece
, a Turkish merchant ship in service 1938-85