Former Owner
- Kartause Erfurt1
- Khouri, Elias Alexander1
- Klaus Dieter Dahmen1
- Lambach Abbey1
- Laurence Kirby1
- Laurence Vaux1
- Leopold Gruber1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Long Island Historical Society, Maine1
- Lorenzo Antonio da Ponte1
- Lorenzo de Olivera1
- Louis Charles Karpinski1
- Louis Herbert Gray1
- Louis Loewe1
- Louis Lucien Bonaparte1
- Louis XIV of France1
- Lucien Graux1
- Lucrezio Palladio degli Olivi1
- Luigi Serra di Cassano1
- Luis Mayora1