Former Owner
- Juana I of Castile1
- Julian Burgueño1
- Julius Hess1
- Justin MacCarthy Reagh1
- Katherine Petersen1
- King Lawrence Parker1
- Kloster Kuringen1
- Konrad von Maurer1
- Lady Margaret Ayloffe1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Lathrop Colgate Harper2
- Laurence Claiborne Witten II2
- Laurent Campagne1
- Laurentius van der Torqel1
- Lawrence J. Schoenberg15
- Legoué1
- Leicester Harmsworth1
- Leo S. Olschki Editore8
- Leonardo Lapiccirella1