Former Owner
- John Morgan1
- John Peacock1
- John Read Dore1
- John Ruskin1
- John Topham1
- John Walker1
- John Willis1
- Joseph Mayner1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Kloster Kuringen1
- Lady Margaret Ayloffe1
- Laurence Claiborne Witten II1
- Laurent Campagne1
- LeMare1
- Legoué1
- Leonardus Martinotius1
- Lepeletier de Rosanbo1
- Librairie Tross1
- Library of the Dominicans of Paris1
- Lionel Tollemache, 4th Earl of Dysart1