Former Owner
- John Hunt1
- John Jarsey1
- John Lee1
- John Roland Abbey1
- John Rolls, 1st Baron Llangattock1
- John Ruskin1
- John Towneley1
- John Wallop, Viscount Lymington1
- John Ward, 1st Earl of Dudley1
- Joost Ritman1
- Jorge de Ataíde1
- Joseph Barrois8
- Joseph Neeld1
- José Fernando Ramírez2
- Juan Burgueño1
- Juan de Gayferos de Eguiraum1
- Juan de Iriarte y Cisneros1
- Judith Lady Montefiore College1
- Julian Burgueño1
- Kaikhusroo Minocher Jamaspasa2