Former Owner
- John III of Portugal2
- John Paget1
- John Payne Collier1
- John Roland Abbey1
- John Towneley1
- John Walker1
- John Ward, 1st Earl of Dudley1
- Joost Ritman1
- Joseph Barrois1
- Joseph Mayner1
- Joseph Pope1
- José Fernando Ramírez1
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juan de Londono1
- Judith Lady Montefiore College1
- Julian Burgueño1
- Justin MacCarthy Reagh1
- Jón Þorstensson1
- Kang Youwei1