Unterpremstätten is a former municipality in the district of Graz-Umgebung, in the Austrian state of Styria. It lies in the federal province of Styria in southeastern Austria, within the Graz-Umgebung district that surrounds the city of Graz.
Since the 2015 Styria municipal structural reform, Unterpremstätten is no longer an independent municipality and has been part of the municipality of Premstätten. The reform merged it with neighbouring communities into the newly formed Premstätten.