Former Owner
- John Caryll1
- John F. Fleming1
- John Trotter Brockett1
- Joseph Barrois1
- Joseph François René de Kergariou1
- Joseph Jekyll1
- Joseph Whitney1
- Juana I of Castile1
- Julius Hess1
- Justin MacCarthy Reagh1
- Kloster Kuringen1
- Latham family1
- Laurence Claiborne Witten II1
- Laurentius van der Torqel1
- Leonardo Lapiccirella1
- Long Island Historical Society, Maine1
- Louis XIV of France1
- Lucien Magne1
- Luigi Serra di Cassano1
- Manuel John Johnson1