Former Owner
- M. Haimmiller1
- M. Lee1
- M. Pierre Guarin1
- Madame Théophile Belin1
- Maffeo Pinelli1
- Magby, H1
- Maggs Bros Ltd40
- Maksymilian Mielzynski1
- Mannheimer Hofbibliothek1
- Mannucci family1
- Manoel S. Pinto1
- Mantell1
- Manuel John Johnson1
- Marc-René de Voyer d'Argenson1
- Marcantonio Contarini1
- Marcantonio V Borghese1
- Marcel Mirgodin1
- Marcela Gabriela1
- Marchese Linterno2
- Marchese Porri-Carcani1