Former Owner
- Johannes de Helb1
- John Cochran1
- John Fletcher Hurst1
- John Henry Ellis1
- John Josias Conybeare1
- John Roland Abbey1
- Joost Ritman1
- Joseph Barrois1
- Julius Heinrich Jeidels1
- Julius de Cardelinis1
- Katherine Somerset Wyttenbach Fenwick1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Laura Hurd Motion1
- LeMare1
- Lepeletier de Rosanbo1
- Leslie, John (c. 1840), bookseller1
- Librairie Tross1
- Library of the Dominicans of Paris1
- Louis XII of France1
- Luigi Clerici1