Former Owner
- Lambach Abbey1
- Lancino Curti1
- Lathrop C. Harper, Inc.1
- Laurence William Hodson1
- Laurentius van der Torqel1
- Law Society1
- Leonard Baskin1
- Leonard Grey, 1st Viscount Grane1
- Leopold Gruber1
- Librairie Damascène Morgand1
- Libreria antiquaria Mediolanum1
- Libreria la Bibliofila1
- Lionardo di Paolo Adimari1
- Lionel Tollemache, 4th Earl of Dysart1
- Lisa Unger Baskin1
- Little family1
- Llanthony Priory1
- Louis Herbert Gray1
- Louis XII of France1
- Ludovico Settala1