Former Owner
- Madeleine Cosman1
- Mademoiselle de Malberghe1
- Madyājñika Devakṛṣṇa1
- Maffeo Pinelli1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Maheśa1
- Maksymilian Mielzynski1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Mannheimer Hofbibliothek1
- Mannucci family1
- Manoel Pereira da Sylva1
- Manookjee Sorabjee Ashburner1
- Mantell1
- Manuel John Johnson1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Marc-René de Voyer d'Argenson1
- Marcantonio Contarini1
- Marcantonio V Borghese1
- Marcel Mirgodin1