Frauenberg is a former municipality in the district of Bruck-Mürzzuschlag, in the Austrian state of Styria. It lies in the Mürztal, the valley of the Mürz river, in the eastern part of the state.
Since the 2015 Styria municipal structural reform, Frauenberg has been part of the municipality of Sankt Marein im Mürztal. It is therefore no longer an independent administrative unit but a component of that larger municipality.