Former Owner
- Khammāsh, Aḥmad1
- Khouri, Elias Alexander1
- King Lawrence Parker1
- Kloster Bredelar1
- Kloster Rebdorf1
- Kāle, Gālambhaṭṭa1
- Kāle, Janārdana1
- Lajos Graf Apponyi de Nagy-Appony1
- 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