Former Owner
- Jean E. Austin1
- Jeremy C. Jackson1
- Joachim Guerrinus de Montefegatesio1
- Johan Laborya de Mossach1
- Johannes Patou1
- Johannes Vivianus1
- John D. Stanitz2
- John Frederick Lewis22
- John Henry Ellis1
- John Hinsdale Scheide1
- John Josias Conybeare1
- John Ruskin2
- John Wright1
- Joost Ritman5
- Joseph Barrois2
- Laurence Claiborne Witten II2
- Laurence Vaux1
- Lawrence J. Schoenberg8
- Leicester Harmsworth1
- Leo Olschki1