Former Owner
- 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
- Lydia Thompson Morris1
- M. Louise Stowell1
- Mademoiselle de Malberghe1
- Magby, H1
- Marie Thomas1
- Mark Lansburgh1