Burg Heinfels is a castle in Heinfels, Tyrol, Austria. It stands in the Puster Valley, near the entrance to the Villgraten Valley. First mentioned in 1243, belonging to the County of Gorz, and was expanded on the west side in 1500. In 1526, it was besieged by Michael Gaismair and 2,000 soldiers seeking to overthrow Catholic rule in the area. Today it is privately owned.