Former Owner
- John M Cuthbert1
- John Roland Abbey1
- John Topham1
- John Trotter Brockett1
- John Wright1
- Joseph François René de Kergariou1
- Joseph Whitney1
- José Antonio Conde1
- Julius Hess1
- Justin MacCarthy Reagh1
- Katherine Petersen1
- Kloster Kuringen1
- Lady Margaret Ayloffe1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Laurence Claiborne Witten II1
- Laurent Campagne1
- Laurentius van der Torqel1
- Legoué1
- Leicester Harmsworth1