Rychvald, Castle ruin cultural monument in Lysice, Czech Republic.

Rychvald is a ruined castle about 1.5 km from Lysice in the Blansko district, protected as a cultural monument. It has two parts: a triangular outer bailey of 30 × 25 m, once holding only wooden buildings, and a walled core of 55 × 30 m behind a rock-cut ditch up to 17 m wide and 6.5 m deep. The perimeter walls are up to 2.7 m thick; parts of the palace masonry, the parkán and the rear section survive, along with a rock-cut staircase.

Rychvald was built in the mid-14th century by members of the Kunštát family, probably Kuna III of Kunštát and Lysice. In 1375 troops of Brno townsmen captured and demolished it, but it was soon restored and from 1398 belonged to the Lysice estate. During the Margrave Wars Ješek Puška and his successors used it for raids; damaged in the Hussite Wars, it probably vanished in the first half of the 15th century.

The castle took its name from the Kunštát family branch that wrote itself "of Rychvald"; Ješek Puška of Kunštát is recorded with the predicate as early as 1371. In the margrave wars the site served Ješek Puška and his successor Heralt Puška as a base for raiding the surrounding countryside.

The ruin lies about 1.5 km from Lysice in the Blansko district. The approach neck keeps only a ditch 10–18 m wide, and a second ditch 17 m wide and up to 6.5 m deep, partly cut into rock, separates the outer bailey from the core. A rock-cut staircase links the lowered rear part to the palace section.

Two iron-plated doors from Rychvald are now fitted in the cellar of Lysice Castle. Archaeologist František Zřídkaveselý investigated the site in the 20th century, and the ruin has been protected as a cultural monument.