Pirka is a former municipality in the district of Graz-Umgebung, in the Austrian state of Styria. It lies in the southeastern part of the country, within the Graz metropolitan area.
Since the 2015 Styria municipal structural reform, Pirka has been part of the municipality of Seiersberg-Pirka, which was formed by merging Pirka with the neighbouring municipality of Seiersberg.