Former Owner
- John Eliot Hodgkin1
- John Gribbel1
- John Harrison-Broadley1
- John Hirst1
- John Hope, 1st Marquess of Linlithgow1
- John Shelton Lawrence1
- Joseph Barrois1
- Juan de Aillon1
- Juan de Torquemada1
- Katherine Petersen1
- Lajos Graf Apponyi de Nagy-Appony1
- Leo Olschki1
- Leonardo Bruni1
- Leonello d'Este, Marquis of Ferrara1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Luis Escobet1
- Lycée Louis-le-Grand1
- Maffeo Pinelli1
- Mannucci family1
- Marcianus F. Rossi1