Kirchbach in Steiermark is a former municipality in the district of Südoststeiermark, in the Austrian state of Styria. It is located in the southeast of the country, within the broader Südoststeiermark region near the border with Slovenia.
Since the 2015 Styria municipal structural reform, Kirchbach in Steiermark has been part of the municipality of Kirchbach-Zerlach. The reform merged it with the neighbouring community of Zerlach, and Kirchbach-Zerlach now serves as the administrative unit covering the area.