Former Owner
- John Egerton, 3rd Earl of Bridgewater2
- John III of Portugal2
- John Lee2
- John Roland Abbey2
- John Towneley2
- John Wright2
- Joseph L. Lilly2
- Joseph Pope2
- Josephine Widener Wichfield2
- Kaikhusroo Minocher Jamaspasa2
- Karl F. Morrison2
- Karva, Lakṣmaṇabhaṭṭa2
- Laurence William Hodson2
- Leonardo Lapiccirella2
- Librairie Damascène Morgand2
- Libreria la Bibliofila2
- Lionel Tollemache, 4th Earl of Dysart2
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn2
- Louis de Gruuthuse2
- Lucien Gougy2