Former Owner
- Lady Margaret Ayloffe1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Laurent Campagne1
- Lawrence J. Schoenberg13
- Legoué1
- Leicester Harmsworth1
- Lionel Tollemache, 4th Earl of Dysart1
- Lisa Norris Elkins1
- Little family1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Long Island Historical Society, Maine1
- Lorenzo Berdute1
- Louis César de La Baume Le Blanc3
- Louis XIV of France1
- Lucien Delamarre1
- Lucien Magne1
- Luigi Celotti1
- Luigi Serra di Cassano1
- Luis Ordoñez1