Annabichl Castle, Medieval castle in Klagenfurt, Austria.

Annabichl Castle stands on a hill about 30 metres above the Sankt Veiter Straße in the north of Klagenfurt. Its main house is a three-storey building with five window axes facing east; that east facade is richly decorated, while the west facades are plain. South of it stands a Baroque chapel dedicated to Saint Anne, built after 1774, and a historic terraced garden runs down to the Sankt Veiter Straße.

The castle was built in the 16th century by George Khevenhüller for his second wife Anna von Thurzo, from whom it took its name. It later came under the ownership of Archduchess Maria Anna of Austria, a change that reflected its standing as a noble residence.

The chapel south of the main house is dedicated to Saint Anne, the castle's namesake, and was built after 1774, replacing or following earlier devotional use on the estate. Its dedication ties the private residence to the name Anna carried by Georg von Khevenhüller's wife and by later owners. The chapel is not open to the public, as the castle is privately used.

The castle stands on a hill about 30 metres above the Sankt Veiter Straße, a main approach road from the north of Klagenfurt; the east-facing main facade looks down over it. It is privately owned and not open to the public, so it can only be viewed from outside. The historic terrace garden runs down to the St. Veiter Straße.

The castle was built between 1580 and 1587 by Georg von Khevenhüller for his second wife, Anna, and the estate and the surrounding district both carry her name. The main house has five window axes facing east, while the west facades are plain. Since 1960 the Österreichische Jungarbeiterbewegung has used it as a Europahaus, and it remains in private ownership, closed to the public.