Former Owner
- John Henry Gurney Jr.1
- John Ives1
- John M Cuthbert1
- John Patteson1
- John R. Anderson & Co1
- John Swyntoun1
- Joseph Anton Koch1
- Joseph Whitney1
- Joseph-Félix Allard1
- José Antonio Conde1
- Juana I of Castile1
- Julius Hess1
- Jérôme Bignon1
- Lathrop C. Harper, Inc.1
- Laurentius van der Torqel1
- Leigh Baker1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Loftus Bland1
- Louis César de La Baume Le Blanc1