Former Owner
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Laurent Campagne1
- Laurentius van der Torqel1
- Legoué1
- Leonardo Lapiccirella1
- Librairie Damascène Morgand1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Lionel Tollemache, 4th Earl of Dysart1
- Lisa Norris Elkins1
- Little family1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Loftus Bland1
- Long Island Historical Society, Maine1
- Lorenzo Berdute1
- Louis Thompson Rowe1
- Louis XIV of France1
- Lucien Delamarre1
- Lucien Magne1