Former Owner
- Jeremy C. Jackson1
- Jeronimus Maelens1
- Jerónimos Monastery8
- Joachim Guerrinus de Montefegatesio1
- Joachim, Baron von Windhag1
- Johan C. Jackson1
- Johann Heinrich van Ess9
- Johannes Abezier1
- Johannes Patou1
- Johannes de Helb1
- Johem Spiess1
- John Boykett Jarman1
- John Browne1
- John E. Burton1
- John Eliot Hodgkin1
- John Estmond1
- John Fletcher Hurst1
- John Frederick Lewis532
- John Henry Ellis1
- John III of Portugal2