Former Owner
- John Campbell, 1st Marquess of Breadalbane1
- John D. McKenna1
- John F. Fleming1
- John Henry Gurney Jr.1
- John M Cuthbert1
- John Patteson1
- John R. Anderson & Co1
- John Rolls, 1st Baron Llangattock1
- John Swyntoun1
- Joseph Anton Koch1
- Joseph Whitney1
- José Antonio Conde1
- Juana I of Castile1
- Julius Hess1
- Jérôme Bignon1
- Lathrop C. Harper, Inc.1
- Lathrop Colgate Harper1
- Laurence Claiborne Witten II1
- Laurentius van der Torqel1
- Leonello d'Este, Marquis of Ferrara1