Hafnerbach is a town in the district of Sankt Pölten-Land, in the Austrian state of Lower Austria. It lies in the eastern part of the country, within the federal province that surrounds the city of Sankt Pölten.
Administratively, Hafnerbach belongs to the Sankt Pölten-Land district, one of the districts that make up Lower Austria. The town is one of several municipalities within this district, which takes its name from the provincial capital, Sankt Pölten.
As a municipality in Lower Austria, Hafnerbach forms part of the broader cultural and administrative landscape of the region, which is Austria's largest federal state by area and lies in the country's northeast.