Former Owner
- Louis de Gruuthuse1
- Lucien Gougy2
- Lucien Graux1
- Lucy Evans Chew2
- Luigi Cora1
- Luini, Pacifico (Franciscan priest), active 19th century1
- Lydia Thompson Morris2
- M. De La Tour1
- Mademoiselle de Malberghe1
- Maggs Bros Ltd2
- Marc-René de Voyer d'Argenson1
- Marchese Porri-Carcani1
- Margaret Le Seigneur1
- Marguerite of Lorraine1
- Marie Thomas1
- Mario Maffei1
- Marion Lawrence1
- Martin Breslauer1
- Marvin-L. Colker2
- Mary Stanley, Countess of Derby1