Former Owner
- Lambach Abbey1
- Laurence Kirby1
- Leo Olschki1
- Leopold Gruber1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lorenzo Antonio da Ponte1
- Lorenzo de Olivera1
- Louis Charles Karpinski1
- Louis César de La Baume Le Blanc1
- Louis Lucien Bonaparte1
- Lucrezio Palladio degli Olivi1
- Luigi Clerici1
- Luis Mayora1
- M. Favia del Core1
- Magby, H1
- Manoel S. Pinto1
- Manuel Fernández del Castillo1
- Margaret of Croy1
- Maria Ludovica Favia del Core Borromeo1
- Mark Lansburgh1