Former Owner
- John Fenn1
- John Lee1
- John Roland Abbey1
- John Ruskin1
- John Sotheby1
- John Thomas Beer1
- John Ward, 1st Earl of Dudley1
- John William Harshberger1
- Joseph Barrois1
- Juan Burgueño1
- Julian Burgueño1
- Julius de Cardelinis1
- Jérôme Pichon1
- L. Paganthus1
- Lambach Abbey1
- Lancino Curti1
- Laurence William Hodson1
- Leonhardus Cuntius1
- Leopold Gruber1
- Lionardo di Paolo Adimari1