Former Owner
- Joseph Franz Gross1
- Joseph Halle Schaffner1
- Joseph Neeld1
- Joseph Pope1
- Joseph Pulilo1
- José Fernando Ramírez3
- Juan Antonio de la Reguera1
- Juan Burgueño1
- Juan Rodriguez1
- Juan de Gayferos de Eguiraum1
- Juan de Iriarte y Cisneros1
- Juana I of Castile1
- Judith Lady Montefiore College3
- Julian Burgueño1
- Julian I. Edison1
- Julius Heinrich Jeidels1
- Justin MacCarthy Reagh1
- Jérôme Pichon2
- Jón Þorstensson1
- Kang Youwei1