Helfenburk is a castle ruin in the municipality of Krajníčko, 5.5 kilometres (3.4 mi) from the town of Bavorov in the South Bohemian Region of the Czech Republic. It is situated on Malošín stone hill at an altitude of 683 metres (2,241 ft). Between the municipalities of Koječín and Štětín there is a paved road that leads to the castle.