Former Owner
- John William Harshberger1
- Joost Ritman1
- Joseph François René de Kergariou1
- Joseph Pope1
- José Fernando Ramírez1
- Klaus Dieter Dahmen1
- Lambach Abbey1
- Lathrop Colgate Harper1
- Laurence Kirby1
- Laurentius van der Torqel1
- Leonello d'Este, Marquis of Ferrara1
- Lorenzo de Olivera1
- Louis Charles Elson1
- Louis H. Silver1
- Lucien Graux1
- Luigi Serra di Cassano1
- Lyon Cathedral1
- Mademoiselle de Malberghe1
- Maggs Bros Ltd1
- Manuel Fernández del Castillo1