Gallmannsegg is a former municipality in the district of Voitsberg in the Austrian state of Styria.

Since the 2015 Styria municipal structural reform, it is part of the municipality Kainach bei Voitsberg.

[2] Gallmannsegg lies about 30 km northwest of Graz and southeast of the Speikkogel.

The river Kainach has its source in the municipality.

This Styria location article is a stub.