Former Owner
- Joseph Ernst Koch-Sternfeld1
- Joseph Görres1
- Joseph L. Lilly1
- Joseph-Félix Allard1
- Justin MacCarthy Reagh1
- K. B. Starkie1
- Kang Youwei1
- Katherine Petersen1
- Konrad von Maurer1
- Kulturhistorisches Museum Magdeburg1
- Lajos Graf Apponyi de Nagy-Appony1
- Latham family1
- Leonello d'Este, Marquis of Ferrara1
- Little family1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Louis César de La Baume Le Blanc1
- Louis Hercule Timoléon de Cossé-Brissac1
- Louis Jean Gaignat1
- Louis XII of France1
- Lucien Delamarre1