Duino Castle (Castello di Duino in Italian) is a castle located on the coast of the Adriatic Sea, near the village of Duino-Aurisina in the Friuli Venezia Giulia region of Italy. The castle was built in the 14th century and has been owned by the Princes of Thurn and Taxis since 1856.

Duino Castle is well-known for its stunning location and Gothic Revival architecture, which was added by the new owners during the 19th century. The castle overlooks the Gulf of Trieste and is surrounded by a large park, making it a popular destination for visitors who are interested in history and nature.

Today, Duino Castle hosts cultural events, including concerts, exhibitions, and conferences. The castle also has a museum that displays historical and artistic objects, as well as a library that contains more than 30,000 volumes. The castle is open to the public for guided tours.