Former Owner
- Joachim Guerrinus de Montefegatesio1
- Joannes Salzperg1
- Johan Gröf1
- Johann Michael Schiller1
- Johannes Betrus Ravenoldus1
- John Alexander Stewart1
- John Carter1
- John Cochran1
- John Edgar Ker1
- John Henry Ellis1
- John Henry Wrenn1
- John Hinsdale Scheide1
- John Hunt1
- John Jarsey1
- John Lee1
- John Wallop, Viscount Lymington1
- John Ward, 1st Earl of Dudley1
- José Fernando Ramírez1
- Juan de Iriarte y Cisneros1
- Judith Lady Montefiore College1