Former Owner
- Law Society1
- LeMare1
- Legoué1
- Leonard Baskin1
- Leonard Grey, 1st Viscount Grane1
- Leonardus Martinotius1
- Leonhardus Cuntius1
- Leopold Gruber1
- Lepeletier de Rosanbo1
- Levi, David, active 19th century1
- Librairie Tross1
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Lionardo di Paolo Adimari1
- Lisa Norris Elkins1
- Lisa Unger Baskin1
- Little family1
- Llanthony Priory1
- Lodi Cathedral1