Former Owner
- Joseph François René de Kergariou1
- Joseph Görres1
- Joseph Pope1
- Joseph Pulilo1
- Joseph-Félix Allard1
- Juan Antonio de la Reguera1
- Juan de Aillon1
- Juan de Torquemada1
- K. B. Starkie1
- Katherine Petersen1
- Klaus Dieter Dahmen1
- Kulturhistorisches Museum Magdeburg1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Laurence William Hodson1
- Leonardo Bruni1
- Leonello d'Este, Marquis of Ferrara1
- Little family1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lucien Delamarre1