Sankt Barbara im Mürztal is since 2015 a market town in Styria, Austria, with 6,726 inhabitants in the judicial district of Mürzzuschlag and in the political district of Bruck-Mürzzuschlag in Styria. As part of the municipality structural reform in Styria, the municipality, which was founded on 1 January 2015, was formed by the merger of the independent municipalities: Mitterdorf im Mürztal, Veitsch und Wartberg im Mürztal.