Burgruine Petersberg is a castle in Friesach, Carinthia, Austria.
Today the castle is home to the Friesach City Museum, which features exhibits about the town's history, culture, mining industry and trade.
46°57′05″N 14°24′09″E / 46.9513888889°N 14.4025°E / 46.9513888889; 14.4025