50°33′34″N 8°26′46″E / 50.55931°N 8.44599°E / 50.55931; 8.44599 Altenberg Abbey (German: Kloster Altenberg) is a former Premonstratensian nunnery situated between Solms and Wetzlar, Hesse, Germany. It was founded in c. 1170 and dissolved in 1802. It had a strong connection with the House of Nassau, several of whom were nuns and abbesses, and some family members, including Otto I, Count of Nassau, were buried here; it was also a burial place for the Counts of Solms. The buildings were seriously damaged by a fire in 1952. Those that survive accommodate a meeting centre for the local deanery and since 2018 a small Protestant religious community.

• LAGIS-Hessen.de
• Landesamt für Denkmalpflege Hessen

• Albert Hardt: Urkundenbuch der Klöster Altenberg, Dorlar, Retters. Wolfenacker 2000
• Randolf Fügen (2003), Highlights in Mittelhessen (in German) (1. ed.), Gudensberg-Gleichen: Wartenberg Verlag, ISBN 3-8313-1044-0
• Hermann-Josef Hucke, ed. (1991), Großer Westerwaldführer (in German) (3. ed.), Montabaur: Verlag Westerwald-Verein e.V., ISBN 3-921548-04-7
• Begründer der Oranier-Linie liegt auf dem Altenberg begraben, Wetzlarer Neue Zeitung, 11 April 2016
• Thomas Doepner: Das Prämonstratenserinnenkloster Altenberg im Hoch- und Spätmittelalter. Sozial- und frömmigkeitsgeschichtliche Untersuchungen. (Untersuchungen und Materialien zur Verfassungs- und Landesgeschichte; 16), Zugl.: Köln, Univ. Diss., ed. Hessisches Landesamt für geschichtliche Landeskunde, N.G. Elwert Verlag, Marburg 1999, ISBN 3-7708-1128-3