Former Owner
- John Ruskin1
- John Walker1
- John West, 1st Earl De La Warr1
- John Wright1
- Juan de Londono1
- Kloster Kuringen1
- Lambertus Eerens1
- Laurent Campagne1
- LeMare1
- Legoué1
- Lepeletier de Rosanbo1
- Library of the Dominicans of Paris1
- Lodovicus Saltariellus1
- Louis Bourguet1
- Louis César de La Baume Le Blanc1
- Louis XII of France1
- Ludwig Rosenthal1
- Luigi Arrigoni1
- Luis Ordoñez1
- Mannheimer Hofbibliothek1