Former Owner
- John Ruskin1
- John Stanley, 18th Earl of Derby1
- John Thomas Beer1
- John Walker1
- Joseph E. Widener1
- Josiah H. Benton1
- Juana Mendel1
- Julius de Cardelinis1
- Karl F. Morrison1
- Lancino Curti1
- Laura Hurd Motion1
- Laurence Claiborne Witten II1
- Laurence William Hodson1
- Leonardus Martinotius1
- Levi, David, active 19th century1
- Libri, Edoardo, active 20th century1
- Lodi Cathedral1
- Lodovicus Saltariellus1
- London School of Jewish Studies1
- Lorenzo Antonio da Ponte1