Former Owner
- John Eliot Hodgkin1
- John Estmond1
- John Hope, 1st Marquess of Linlithgow1
- John Ives1
- John Walker1
- John West, 1st Earl De La Warr1
- Julia Burgess1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Klaus Dieter Dahmen1
- Lambertus Eerens1
- Laurent Campagne1
- LeMare1
- Legoué1
- Leonardus Martinotius1
- Lepeletier de Rosanbo1
- Library of the Dominicans of Paris1
- Louis Bourguet1
- Louis César de La Baume Le Blanc1
- Lucien Graux1
- Luigi Cora1