Former Owner
- Katherine Somerset Wyttenbach Fenwick8
- Lathrop Colgate Harper3
- Laurence William Hodson3
- Lawrence J. Schoenberg8
- Leicester Harmsworth2
- Lepeletier de Rosanbo1
- Lew David Feldman1
- Librairie Tross1
- Library of the Dominicans of Paris1
- Lorenzo Antonio da Ponte1
- Louis César de La Baume Le Blanc1
- Louis H. Silver1
- Louis Thompson Rowe1
- Luigi Celotti7
- Lycée Louis-le-Grand2
- M. Haimmiller1
- Maggs Bros Ltd4
- Margaret Barclay Wilson1
- Marie-François Duchesne de Beaumanoir1
- Mark Lansburgh1