Former Owner
- Lucien Gougy1
- Ludwig Rosenthal1
- Luther Albertus Brewer1
- Lydia Thompson Morris1
- M. De La Tour1
- M. Louise Stowell1
- Madeleine Cosman1
- Madyan Qusuni1
- Madyājñika Devakṛṣṇa1
- Maheśa1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Margaret Barclay Wilson1
- Maria Riddell1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Markus Fugger1
- Marsden J. Perry1