Former Owner
- Kaikhusroo Minocher Jamaspasa1
- Kartause Erfurt1
- Khouri, Elias Alexander1
- King Lawrence Parker1
- Kloster Bredelar1
- Kāle, Gālambhaṭṭa1
- Kāle, Janārdana1
- Lambach Abbey1
- Lancino Curti1
- Lathrop C. Harper, Inc.1
- Leigh Baker1
- Leo Olschki1
- Leopold Gruber1
- Libreria la Bibliofila1
- Lionardo di Paolo Adimari1
- Louis Herbert Gray1
- Ludovico Settala1
- Luther Albertus Brewer1
- Madeleine Cosman1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1