Burg Frauenburg, Medieval castle in Rhineland-Palatinate, Germany

Burg Frauenburg is a medieval castle ruin located along the Nahe River in Rhineland-Palatinate. The site retains two towers and portions of walls that remain visible today, positioned at a historic river crossing point.

The Frauenburg was built before 1327 by the Counts of Sponheim and belonged to the rear county. From 1331 it served Countess Loretta of Sponheim as her widow's seat after she handed over government to her son John III. It was later the seat of a Sponheim bailiff and was destroyed in 1673 during the Wildfang feud by troops from Lorraine.

The name Frauenburg ("women's castle") recalls Countess Loretta of Sponheim, who moved here in 1331 after handing rule to her son John III. The castle later housed a Sponheim bailiff. The ruin is not the castle built at Birkenfeld in 1328 by Baldwin of Luxembourg.

The site can be reached by hiking trails and sits in hilly terrain that is well suited for walking. Visitors should wear sturdy shoes as the paths are sometimes steep and uneven.

The south tower, 33 m high, can be climbed as a viewing tower by prior arrangement. The castle was destroyed in 1673 during the Wildfangfehde by troops from Lorraine, not by French soldiers. The round towers on the attack side survive almost to full height, behind a neck ditch.