Former Owner
- Lancino Curti1
- Laurence Claiborne Witten II1
- Laurence Kirby1
- Law Society1
- Lawrence J. Schoenberg14
- Leicester Harmsworth1
- Leo Olschki2
- Leonard Grey, 1st Viscount Grane1
- Levi, David, active 19th century1
- Lionardo di Paolo Adimari1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn2
- Lodovicus Saltariellus1
- Lorenzo Antonio da Ponte1
- Louis César de La Baume Le Blanc1
- Louis Lamm1
- Louis Thompson Rowe1
- Lucrezio Palladio degli Olivi1
- Ludwig Rosenthal's Antiquariaat1
- Luigi Celotti2
- Luigi Clerici1