The Princes' House (German: Prinzenhaus) in Plön in the North German state of Schleswig-Holstein is a former royal summer residence in the grounds of the park at Plön Castle. It is the only surviving maison de plaisance in Schleswig-Holstein.

It was given its present name because at the end of the 19th and beginning of the 20th century it was used as a residence and school for the sons of the German emperor, William II. At that time it was enlarged with two extensions. A farm on nearby Princes' Island served the princes as a learning site for agricultural skills.

• Deutsche Stiftung Denkmalschutz (Hg.in): Kulturerbe bewahren. Förderprojekte der Deutschen Stiftung Denkmalschutz. Bd. 3: Schlösser, Burgen, Parks. Monumente, Bonn 2004, ISBN 3-936942-44-7, S. 202–211.
• Dehio: Handbuch der Deutschen Kunstdenkmäler Hamburg, Schleswig-Holstein. Deutscher Kunstverlag, München 1994, ISBN 978-3-422-03033-6
• J. Habich, D. Lafrenz, H. Schulze, L. Wilde: Schlösser und Gutsanlagen in Schleswig-Holstein. L&H Verlag, Hamburg 1998, ISBN 978-3-928119-24-5

• Prinzenhaus, Plön
• Friends of the Plön Prinzenhaus (in German)
• Insights of Plön with historic postcards of the Prinzenhaus (in German)
• More details and photographs at www.monumente-online.de (in German)

54°09′15″N 10°24′33″E / 54.154119°N 10.409117°E / 54.154119; 10.409117