Burg Konzenberg, Medieval castle ruins in Wurmlingen, Germany.

Burg Konzenberg is a ruined spur castle on a west-northwest-facing ridge near Wurmlingen. Its main surviving structure is a massive bergfried about 13 metres high, with a square plan of roughly 12.5 by 12.5 metres and walls 4 metres thick. The tower was built of tuff blocks from the Hegau, not local White Jurassic stone, and its entrance lies about 10 metres above ground. Remains of the perimeter wall and ditches also survive.

The fortress was built by the Wartenberg family and sold in 1300 to Bishop Heinrich II of Konstanz. After secularization around 1802, it fell into decline and was partially demolished in 1820.

The fortress represents medieval military architecture of Baden-Württemberg, with its defensive walls forming a narrow trapezoid exceeding 50 meters on each side.

The ruin is reached on foot: a path from the north crosses the neck ditch, or a newer forest track leads in from the spur. The neck ditches are deeper than the side ditches, and the outer earthwork's western and northern ramparts are cut by forest paths.

The keep was built not from local White Jurassic limestone but from tuff quarried in the distant Hegau region, cut into large bossed ashlar blocks. One corner stone bears an unidentified coat of arms.