Former Owner
- Maksymilian Mielzynski1
- Malvezzi de' Medici1
- Mannheimer Hofbibliothek1
- Mannucci family1
- Manuel Fernández del Castillo3
- Manuel John Johnson1
- Marcantonio Contarini1
- Marcantonio V Borghese1
- Marcel Mirgodin1
- Marchese Linterno2
- Marchese Porri-Carcani1
- Marcianus F. Rossi1
- Marco Antonio Morosini1
- Marco da Bologna1
- Margaret Anna Hazard1
- Margaret Barclay Wilson2
- Margaret Le Seigneur1
- Margaret of Croy1
- Marguerite de Belleville1
- Marguerite de Fontenay1