Former Owner
- Joannes Hainricus Ebron zu Wildenberg1
- Johan C. Jackson1
- Johann Heinrich van Ess3
- Johannes de Helb1
- John Boykett Jarman1
- John Eliot Hodgkin1
- John Fletcher Hurst1
- John Frederick Lewis47
- John Harvey Treat1
- John Haskell Shedd1
- John III of Portugal2
- John Morgan1
- John Rolls, 1st Baron Llangattock3
- John Ruskin2
- John Walker1
- John William Harshberger1
- Joseph Anton Koch1
- Joseph François René de Kergariou1
- Joseph Pope1
- José Fernando Ramírez1