Schloss Ritzen, Medieval castle and museum in Saalfelden am Steinernen Meer, Austria.

Schloss Ritzen is a three-storey building with four window axes on its front facade, standing on a flat hill in the south of Saalfelden above the Ritzensee. It is a small remnant of a larger complex, probably a side wing, and preserves one round tower of the medieval ring wall, restored with a new roof. A segmental-arched stone portal bears the date 1593, and traces of late 16th-century paintings above the windows and at the corners were reproduced in the 1960s. Inside are late Gothic vaults.

The castle was first mentioned in 1339 under the name Grub and changed hands multiple times over the centuries. A fire in 1892 caused substantial damage, but the building was later restored and eventually converted into a museum.

Since 1968 the main building has housed the Saalfelden local history museum, whose nativity collection is among Austria's largest and most important in folklore terms. Many cribs are by the Saalfelden maker Xandi Schläffer, who died on 18 November 1984; he built Pinzgau crib villages around the Bethlehem stable, with farmhouses, stone roofs and the Steinernes Meer painted behind.

The museum occupies the main building of the former castle, with around 1,200 square metres of exhibition space across 22 rooms on several floors. The ground floor, reworked in the 2010s, covers Saalfelden's history from early times to its elevation to town status; the nativity collection and special exhibition rooms are on the first floor. The building stands on a flat hill in the southern part of Saalfelden, above the artificial Ritzensee bathing lake, and a historic mill was erected beside it.

The name Ritzen comes not from the Weitmosers but from Haimeran Ritz, who bought the estate from Christoph Weitmoser's heirs in 1604. His son grew very rich and then lost the fortune through an extravagant lifestyle, and the family died out in the male line.