Former Owner
- Judith Lady Montefiore College1
- Julius de Cardelinis1
- Katherine Somerset Wyttenbach Fenwick1
- L. Paganthus1
- Lajos Graf Apponyi de Nagy-Appony1
- Lambach Abbey1
- Lancino Curti1
- Laurence William Hodson1
- Leonardo Bruni1
- Leonhardus Cuntius1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Louis-Jean-Nicolas Monmerqué1
- Lucien Gougy1
- Ludovico Settala1
- Luini, Pacifico (Franciscan priest), active 19th century1
- Malvezzi de' Medici1
- Mannucci family1
- Marcianus F. Rossi1
- Mario Maffei1
- Mary Augusta Strachey1