Burg Tringenstein, Medieval castle in Siegbach, Germany.

Burg Tringenstein is the ruin of a hilltop castle at 532 m above sea level above the village of Tringenstein in the municipality of Siegbach, Lahn-Dill district. Only a few wall remains and a model of the castle are visible on the hill today; the main building was demolished in 1839 and the site later used as a quarry.

Burg Tringenstein was built in 1350/51 on the Murstein hill by Countess Adelheid, widow of Count Otto II of Nassau-Dillenburg, as a countermeasure to the new Hessian castle Neu-Dernbach; the hill belonged to the lords of Bicken. It was first named in a charter of 23 March 1356 and was probably identical with the castle "Murstein" mentioned in 1352. It became the seat of the Nassau district court of Tringenstein, opposite the Hessian office of Blankenstein, and served as a hunting lodge in the Schelderwald. Expanded by Count Johann IV, it was temporarily a residence around 1500 and again at the start of the Thirty Years' War. After the office moved to Ebersbach in 1725 the castle stood empty; its contents were sold in 1773/74, the main house was demolished in 1839, and the ruin was later quarried away.

The village of Tringenstein grew up together with the castle after its construction around 1350/51, and the two share a name to this day. The counts of Nassau used the castle as a hunting lodge in the Schelderwald hunting grounds, and around 1500 Count Johann IV expanded it into a residence where Countess Elisabeth lived for a time.

The castle is located in Siegbach in Hesse's hilly countryside and is accessible via regional roads. Visitors should note that paths can be uneven in places and sturdy footwear is advisable.

The hilltop today shows only a few wall remnants and a model reconstruction of the castle; the main building was demolished in 1839 for fear of collapse, after the site had been quarried for stone.