Burgruine Heilsberg, Medieval castle ruin in Wiesent, Germany.

Burgruine Heilsberg is a hilltop castle ruin at 420 m above sea level, about 200 m southeast of the Pangerlhof hamlet in the municipality of Wiesent, Bavaria. The site retains a square keep measuring 7.5 by 7.5 m, built of cast masonry faced with 2.5 m thick granite bossed ashlars, along with remnants of the surrounding walls and ring wall. A deep neck ditch and rampart system, including a gate structure suggested by wall remains in the southeast, are still visible.

The castle arose in the mid-12th century when the Heilsberg family established their rule in this region. Ulrich von Heilsberg appears in records around 1170, documenting the family's presence at this location during that era.

The castle carries the name of the Heilsberg family, who ruled from this location and shaped the surrounding lands. Today the site stands as a quiet reminder of medieval power structures in this forested region.

The site is reachable on foot by forest paths that vary in condition depending on the season. Sturdy footwear is recommended, and visitors should allow time to explore the scattered remains throughout the landscape.

Abbot Stephan of Frauenzell wrote in 1644 that Heilsberg was an ancient castle built of ashlar blocks and already collapsed; of the chapel of St. Ägidius only rubble remained. The keep itself was square, 7.5 by 7.5 metres, of cast masonry faced with granite blocks 2.5 metres thick.