Former Owner
- John Ruskin1
- John Topham1
- John West, 1st Earl De La Warr1
- John Willis1
- John Wright2
- Joseph E. Widener7
- Josephine Widener Wichfield2
- Judith Lady Montefiore College1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Lady Margaret Ayloffe1
- Lambertus Eerens1
- Lawrence J. Schoenberg1
- Leonardus Martinotius1
- Librairie Tross1
- Lionel Tollemache, 4th Earl of Dysart1
- Lodovicus Saltariellus1
- Louis Bourguet1
- Louis César de La Baume Le Blanc1
- Louis XII of France1
- Luigi Cora1