Former Owner
- Joseph Pope1
- Joseph Pulilo1
- Joseph ben Aryeh1
- Joseph-Félix Allard1
- Juan Antonio de la Reguera1
- Juan de Aillon1
- Juan de Torquemada1
- Judah ben Moses, ha-Rofe, ha-Kohen1
- Julian I. Edison1
- Justin MacCarthy Reagh1
- Jón Þorstensson1
- K. B. Starkie1
- Kang Youwei1
- Katherine Petersen1
- Klaus Dieter Dahmen1
- Konrad von Maurer4
- Kulturhistorisches Museum Magdeburg1
- Lady Frances Bentinck1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1