Hällefors Municipality is a municipality in Örebro County in central Sweden. Its seat is located in the town of Hällefors.

Örebro County is a county or län in central Sweden. It borders the counties of Västra Götaland, Värmland, Dalarna, Västmanland, Södermanland and Östergötland. It is frequently culturally divided into the hilly northern region of Bergslagen, where mining and metallurgic industry have been important since the Middle Ages, and the southern Mälardalen of lakes and farms.