Schauenburg, Medieval castle ruins in Selzach, Switzerland

Schauenburg is a ruined medieval castle located on a rocky ridge southwest of Selzach in the Canton of Solothurn. The site preserves wall fragments, a tower, and the foundations of a defensive ring wall structure.

No written record of the castle survives. Werner Meyer dates its founding to the 12th century and links it perhaps to a ministerialis family documented around 1214 that named itself after Bettlach; it was probably abandoned before 1300. Ferdinand Eggenschwiler held it was built to control the pass north from the Aare valley between Hasenmatt and Stallflue. Franz Haffner wrote in 1666 that it perished in the English invasion, perhaps the Guglers of 1375.

No document names the castle's builders; the only family link is Werner Meyer's suggestion that it may have been the seat of a ministerial lineage attested around 1214 and named after Bettlach. Local tradition long attributed it to the "Edlen von Schauberg", a claim Armand Streit published in 1865 and that Meyer and Eggenschwiler do not support.

The ruins can be reached via local trails from Selzach and parking is available for visitors driving by car. The hilltop location involves some climbing effort to reach the site.

No document mentions the castle before the 19th century: Werner Meyer states there is no written record of it at all. The claim that it fell in 1375 comes from Franz Haffner's 1666 chronicle, which blamed the castle's end on the English incursion, meaning the Guglers' raid. Armand Streit's 1865 attribution to the lords of Schauberg is not supported by Meyer or Eggenschwiler.