Demir Hisar (Macedonian: Демир Хисар [dɛˈmir‿xisar] ⓘ) is a municipality in the southwestern part of North Macedonia.

Demir Hisar, which means "iron fortress" in Turkish, is also the name of the town where the municipal seat is located.

The Demir Hisar Municipality is part of the Pelagonia Statistical Region.

According to the 2021 North Macedonia census, this municipality has 7,260 inhabitants.

[2] Ethnic groups in the municipality include: