Former Owner
- Lambach Abbey1
- Lambertus Eerens1
- Lancino Curti1
- Lathrop Colgate Harper1
- Laura Hurd Motion1
- Laurence Kirby1
- Law Society1
- Leicester Harmsworth1
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara1
- Librairie Tross1
- Lionel Tollemache, 4th Earl of Dysart1
- Lodovicus Saltariellus1
- London School of Jewish Studies1
- Long Island Historical Society, Maine1
- Louis Bourguet1
- Louis Thompson Rowe1
- Louis XII of France1
- Louis XIV of France1
- Lucien Graux1