Former Owner
- Kartause Erfurt1
- Karva, Lakṣmaṇabhaṭṭa1
- Kenneth X. Robbins1
- Khouri, Elias Alexander1
- Kloster Rebdorf1
- Lajos Graf Apponyi de Nagy-Appony1
- Lancino Curti1
- Lane Theological Seminary1
- Lathrop C. Harper, Inc.1
- Laurence Claiborne Witten II1
- Laurence Kirby1
- Laurence William Hodson1
- Laurentius van der Torqel1
- Law Society1
- Leigh Baker1
- Leonard Grey, 1st Viscount Grane1
- Leonardo Loredan1
- Leonello d'Este, Marquis of Ferrara1
- Librairie Damascène Morgand1
- Libreria antiquaria Mediolanum1