Former Owner
- Jehan de Gaignières1
- Joaquín Gómez de la Cortina1
- Johann David Baier1
- Johann Heinrich van Ess1
- Johann Michael Schiller1
- Johannes Lethe1
- John Alfred Wigan1
- John Bellingham Inglis1
- John Butlar1
- John Camp Williams1
- John Couch Adams1
- John Edgar Ker1
- John Hope, 1st Marquess of Linlithgow1
- John Lee1
- John Thomas Beer1
- John William Harshberger1
- Juan de Aillon1
- Juan de Torquemada1
- Julius de Cardelinis1
- Lajos Graf Apponyi de Nagy-Appony1