Former Owner
- John Camp Williams1
- John Couch Adams1
- John Eliot Hodgkin1
- John Fenn1
- John Hope, 1st Marquess of Linlithgow1
- John Ives1
- John Payne Collier1
- John Shelton Lawrence1
- John Sotheby1
- John Thomas Beer1
- John William Harshberger1
- Joseph Ernst Koch-Sternfeld1
- Joseph Franz Gross1
- Joseph Halle Schaffner1
- Joseph Pope1
- Juan Antonio de la Reguera1
- Juan de Aillon1
- Juan de Torquemada1
- Julie Florence de Cossette1
- Julius de Cardelinis1