Former Owner
- John Peacock1
- John Read Dore1
- John Ruskin1
- John Stow1
- John Topham1
- John Trotter Brockett1
- John Willis1
- Joseph François René de Kergariou1
- Jules Bonhomme1
- Julie Florence de Cossette1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Kenneth Hyde1
- Klaus Dieter Dahmen1
- Kulturhistorisches Museum Magdeburg1
- Lady Margaret Ayloffe1
- Lambach Abbey1
- Lancino Curti1
- Lathrop Colgate Harper1
- Laura Hurd Motion1
- Laurence Kirby1