Former Owner
- James F. Drake1
- James Ley, 1st Earl of Marlborough1
- James Lyell1
- James Rathwell Page1
- James Stevens-Cox1
- Jeremy C. Jackson1
- Johannes Vivianus1
- John Henry Ellis1
- John Hinsdale Scheide1
- John Josias Conybeare1
- John Ruskin1
- Laurence Claiborne Witten II1
- Laurence Vaux1
- Leo Olschki1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Louis Loewe1
- Louis XII of France1
- Maggs Bros Ltd1
- Marco da Bologna1
- Marvin-L. Colker1