Former Owner
- John D. Stanitz1
- John Eliot Hodgkin1
- John Fenn1
- John Holt1
- John Ruskin1
- John Sidney Hawkins1
- John Sotheby1
- Joseph Anton Koch1
- Joseph L. Lilly1
- Joseph Mayner1
- Juan Burgueño1
- Judith Lady Montefiore College1
- Julian Burgueño1
- Lancino Curti1
- Laurence Claiborne Witten II1
- Laurence Kirby1
- Law Society1
- Leicester Harmsworth1
- Leo Olschki1
- Lionardo di Paolo Adimari1