Former Owner
- Maheśa1
- Maksymilian Mielzynski1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Mannheimer Hofbibliothek1
- Mannucci family1
- Manoel S. Pinto1
- Mantell1
- Manuel Fernández del Castillo1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Marcantonio Contarini1
- Marcantonio V Borghese1
- Marcel Mirgodin1
- Marcela Gabriela1
- Marchese Porri-Carcani1
- Marco Antonio Morosini1
- Marco da Bologna1
- Margaret Anna Hazard1
- Margaret F. Woodward1
- Margaret Le Seigneur1