Södingberg is a former municipality in the district of Voitsberg, in the Austrian state of Styria. It lies in the western part of Styria, within the Voitsberg district, a region of rolling hills and Alpine foothills west of Graz.
Since the 2015 Styria municipal structural reform, Södingberg has been part of the municipality of Geistthal-Södingberg, which was formed by merging the previously separate municipalities of Geistthal and Södingberg. As a result, Södingberg is no longer an independent administrative unit but a constituent part of the larger municipality.
Its principal administrative significance is as a former municipality that was absorbed through a statewide local government reorganization. The area is rural in character, consistent with the surrounding Voitsberg district.