Wiesenburg Castle, Medieval castle in Wiesenburg, Germany.

Wiesenburg Castle stands on a hill spur above the southeastern bank of the Zwickauer Mulde in the Wiesenburg district of Wildenfels. Of the medieval castle begun around 1200, only part of the round keep, remnants of the ring wall and a moat remain. The courtyard with its timber-framed buildings and the octagonal gate tower date from the reconstruction of 1664, after the Thirty Years' War.

Construction of the hilltop castle probably began around 1200, and it was first documented in 1251 as "Erbo officiatus de Wissenberck". The Vögte von Weida were its first owners, collecting socage from more than twenty villages; the castle passed to the House of Wettin in 1350 and to the von der Planitz family from 1412 to 1591. In 1523 it was sacked by its own serfs, and after the Thirty Years' War it was rebuilt in 1664, when the courtyard and octagonal gate tower were created. The Palas collapsed in 1803; from 1864 to 1911 an almshouse occupied the castle, and since August 2024 it has belonged to the municipality of Wildenfels.

The castle gave its name to the house of Schleswig-Holstein-Sonderburg-Wiesenburg after Philip Louis of Holstein-Sonderburg bought the estate in 1663. Legends tell of a secret passage linking the castle with a robber's castle in the Kiefericht, a grove across the Mulde valley. The site is recorded as the Bodendenkmal "Schloß in Wiesenburg" since 18 January 1971.

The castle stands on a hill spur above the southeastern bank of the Zwickauer Mulde, between the river and a side stream. It was privately owned from 1992 and closed to the public; the municipality of Wildenfels bought it in August 2024 and plans to reopen it after emergency securing and clearing. No concrete use plans are known yet, so check locally before visiting.

Legends tell of a secret passage linking the castle with a "robber's castle" in the Kiefericht, a grove on the far side of the Mulde valley. The castle area was registered as an archaeological monument on 18 January 1971 under the name "Schloß in Wiesenburg".