Former Owner
- Lambach Abbey1
- Lancino Curti1
- Lathrop Colgate Harper1
- Laura Hurd Motion1
- Laurence Kirby1
- Law Society1
- Leonardus Martinotius1
- Librairie Tross1
- Lionel Tollemache, 4th Earl of Dysart1
- Lodovicus Saltariellus1
- Long Island Historical Society, Maine1
- Louis Bourguet1
- Louis Charles Elson1
- Louis César de La Baume Le Blanc1
- Louis Thompson Rowe1
- Louis XII of France1
- Louis XIV of France1
- Lucien Gougy1
- Lucien Graux1
- Luini, Pacifico (Franciscan priest), active 19th century1