Schloss Kalsdorf, Renaissance château in Kalsdorf near Ilz, Austria.

Schloss Kalsdorf is a four-winged Renaissance château near Ilz in eastern Styria, built around a square courtyard. The ground floor has two-storey arcades on stone pillars, and the east wing carries a three-storey arcade in the courtyard. Two projecting corner towers with pyramid roofs stand on the south wing, whose main portal bears the coat of arms of the Herbersdorf-Lengheim family.

The château was first documented in 1419 and remained under the Herbersdorf family's control for generations. The northern and western wings were built during their tenure and continue to define the structure's character today.

The courtyard enclosed by four wings created a sheltered inner space where the household could gather away from the outside world. This layout reflects how noble families designed their seats to balance private life with the exercise of authority over their lands.

Schloss Kalsdorf is owned by the province of Styria and used for cultural purposes; exhibitions are held there once or twice a year in the evening. Check the current dates beforehand, as there is no regular opening. The building stands in Kalsdorf bei Ilz, in the municipality of Ilz in eastern Styria.

Two stone lions that once stood in Graz were later moved to different locations, including the Agricultural School in Hatzendorf and the Joanneum Museum. This dispersal of the sculptures reveals how this château's history connects to the cultural networks of the region.