Former Owner
- Julius Hess1
- Kenneth Hyde1
- Lajos Graf Apponyi de Nagy-Appony1
- Lancino Curti1
- Lathrop C. Harper, Inc.1
- Laura Hurd Motion1
- Leo Olschki1
- Leonardo Bruni1
- Leonardo Lapiccirella1
- Libri, Edoardo, active 20th century1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lodovicus Saltariellus1
- Louis Bourguet1
- Louis César de La Baume Le Blanc1
- Louis Thompson Rowe1
- Lucien Magne1
- Ludwig Rosenthal's Antiquariaat1
- Maffeo Pinelli1
- Mannucci family1
- Marcela Gabriela1