Burgruine Lobenstein, Medieval castle ruin in Bad Lobenstein, Germany.

Burgruine Lobenstein is a fortified settlement on a hill near Bad Lobenstein, situated at 539 meters in elevation above the surrounding valley. The site shows remaining stone walls and a tower that still stands, offering views of the landscape below and the town.

The castle and its defensive tower were built between 950 and 1150, probably founded by the Lords of Lobdeburg as a knight's seat that grew into the town. Until 1601 it served as residence for the rulers of Lobenstein, first the Vögte of Gera, later the Counts of Reuß. Around 1620 Heinrich II Posthumus used it as a mint. In 1632 Swedish troops stormed it during the Thirty Years' War, and imperial troops later damaged it further; only the roughly 30-meter bergfried, remains of a wall tower and some foundation walls survive.

The town's name derives from the castle, first documented as a knight's seat probably founded by the Lords of Lobdeburg. Until 1601 the castle served as residence of the town's rulers, first the Vogts of Gera, later the Counts of Reuss. Around 1620 Heinrich II Posthumus used it as a mint.

The tower is accessible as an observation tower; the wall tower remains are roofed and form a tower room. The site can be visited as part of a guided tour. The hill cone lies in the middle of the old town, so the approach is short but steep.

The tower is about 30 metres high and is the town's landmark, known locally as the Alter Turm. The remains of a wall tower were given a roof and now form a tower room. The keep and foundations were restored and can be visited on a guided tour.