Former Owner
- M. Louise Stowell1
- M. Pierre Guarin1
- Madame Théophile Belin1
- Madeleine Cosman1
- Mademoiselle de Malberghe1
- Madyan Qusuni1
- Madyājñika Devakṛṣṇa1
- Maffeo Pinelli1
- Magby, H1
- Maheśa1
- Maksymilian Mielzynski1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Mannheimer Hofbibliothek1
- Mannucci family1
- Manoel S. Pinto1
- Mantell1
- Manuel Fernández del Castillo1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Manṣūr, Abū al-Faz̤l ibn Ghiyāth al-Dīn1