Hart bei Graz is a municipality in the district of Graz-Umgebung, in the Austrian state of Styria. It lies in the southeastern part of the country, within the federal province whose capital is the city of Graz.
As part of the Graz-Umgebung district, the municipality belongs to the administrative area surrounding Graz, the provincial capital and Austria's second-largest city. The district takes its name from this position around Graz, and Hart bei Graz is one of the communities that make up the district.
Its name reflects this relationship: "bei Graz" means "near Graz," distinguishing the municipality by its location relative to the nearby city. The municipality is situated in the Styria region, one of Austria's nine federal states.