Schloss Niederleis, Renaissance castle and museum in Niederleis, Austria.

Schloss Niederleis is a Renaissance castle with four wings surrounding an inner courtyard in a structured layout. A stone bridge dating to 1735 connects the main structure to the tower gate and passes over where moats once stood.

Niederleis was first documented in 1308, and the present castle was built in the 16th century. In 1645, during the Thirty Years' War, it was devastated. Abbot Michael Schnabel acquired the estate for Stift Heiligenkreuz in 1651, and the portal bears that year; Kaisersteinbruch master masons supplied Kaiserstein stonework, with bills from 1655–1657 naming the brothers Ambrosius and Giorgio Regondi.

The castle displays art collections featuring Italian furniture, Spanish leather wallpapers, and religious objects spanning several centuries. Visitors can observe items that show the artistic connections between Italy, Spain, and Central Europe.

Visitors must arrange guided tours in advance through the site manager, as the building is not freely accessible. Tours are offered from May through October and should be booked well ahead of time.

The castle chapel holds a large cross from the 14th century attributed to the school of Giotto. This piece hangs above a Spanish Baroque altar and represents a rare meeting of Italian and Spanish artistic traditions.