Voitsberg is a small city in the district of Voitsberg in the Austrian state of Styria. It has a population of around 9,400 as of 2018. The city developed around the St. Margaret church on the Tregistbach river and was first mentioned in 1220 as Civitas.
Remains of the Greisenegg palace and Obervoitsberg castle can still be seen in the area. Another notable site is the Voitsberg Cityhall, which was designed by the architect Arik Brauer.