Former Owner
- Louis César de La Baume Le Blanc1
- Louis Herbert Gray1
- Louis N. Cassett1
- Louis-Jean-Nicolas Monmerqué1
- Lucien Gougy2
- Ludovico Settala1
- Luigi Celotti1
- Luis Fernández de Córdoba y Aragón1
- Luther Albertus Brewer1
- Lydia Thompson Morris1
- Lyon Cathedral1
- M. Haimmiller1
- M. Louise Stowell1
- Madeleine Cosman1
- Maggs Bros Ltd1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Manookjee Sorabjee Ashburner1
- Manūchihr Nukhastīn Āṣaf Qājār1