Former Owner
- Jean Hersmulle Duport18
- Joachim Guerrinus de Montefegatesio2
- John Bigham, 1st Viscount Mersey1
- John Dozier Gordan1
- John Frederick Lewis11
- John Lumley, 1st Baron Lumley1
- John Read Dore1
- John Savile1
- John Wright1
- Jonathan Peckover1
- Joseph Barrois2
- Joseph L. Lilly1
- Joseph-Félix Allard1
- Julia Burgess2
- Kartause Erfurt1
- Katherine Somerset Wyttenbach Fenwick1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Lathrop Colgate Harper2
- Lawrence J. Schoenberg1
- Leicester Harmsworth1