Former Owner
- Jan Six VII1
- Johannes Abezier1
- Johannes Wigg1
- Johannes de Helb1
- Johannes zu Reitheim1
- Johem Spiess1
- John Anderson1
- John D. Stanitz1
- John Eliot Hodgkin1
- John Fletcher Hurst1
- John James Lewis1
- John Read Dore1
- John Wright1
- Joseph Anton Koch1
- Joseph Baer & Co.1
- Joseph May Spetzler1
- Karl F. Morrison1
- Kartause Erfurt1
- Kloster Rebdorf1
- Lathrop C. Harper, Inc.1