Former Owner
- José Antonio Conde1
- Juan Rodriguez1
- Juan de Londono1
- Juana I of Castile1
- Juana Mendel1
- Judah ben Moses, ha-Rofe, ha-Kohen1
- Jules Bonhomme1
- Julie de Busnel1
- Julius Bisno1
- Julius Hess1
- Jérôme Bignon1
- Jérôme Pichon1
- Jón Þorstensson1
- K-L1
- K. B. Starkie1
- Karl Anton, Prince of Hohenzollern1
- Karl Leopold Strauven1
- Keifer1
- Kloster Kuringen1
- Konrad von Maurer1