Former Owner
- John William Harshberger1
- Jonathan Peckover1
- Joseph Görres1
- Joseph L. Lilly1
- Joseph Whitney1
- José Antonio Conde1
- Juana I of Castile1
- Julius Hess1
- Jérôme Bignon1
- K. B. Starkie1
- Katherine Petersen1
- Kenneth Hyde1
- Kloster Bredelar1
- Kloster Rebdorf1
- Konrad von Maurer1
- Kulturhistorisches Museum Magdeburg1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Lathrop C. Harper, Inc.1
- Laurentius van der Torqel1