Former Owner
- Lady Margaret Ayloffe1
- Lajos Graf Apponyi de Nagy-Appony1
- Lambertus Eerens1
- Lancino Curti1
- Latham family1
- Laura Hurd Motion1
- Laurence Kirby1
- Laurentius van der Torqel1
- Law Society1
- Lehn of Denmark1
- Leonard Grey, 1st Viscount Grane1
- Leonardo Bruni1
- Leonardo Lapiccirella1
- Leonardo Loredan1
- Leopold Gruber1
- Leslie Hindman1
- Leslie, John (c. 1840), bookseller1
- Lew David Feldman1
- Libreria la Bibliofila1
- Libri, Edoardo, active 20th century1