Lilienfeld is a city in Lower Austria (Niederösterreich), Austria, located south of St. Pölten in the valley of the Traisen River. The area lies within the region the Ancient Romans called Noricum.
The city is best known as the site of Lilienfeld Abbey. It is also the site of a regional hospital, the Landesklinikum Voralpen Lilienfeld.
A short distance past the abbey is a chair lift station that carries visitors to the top of Muckenkogel, a mountain in the Gutenstein Alps standing 4,095 feet high. On March 19, 1905, Muckenkogel hosted the first official Alpine ski race, won by the Czech-born ski pioneer Mathias Zdarsky.