Former Owner
- Lucien Magne1
- Luigi Arrigoni1
- Luigi Serra di Cassano1
- Mannheimer Hofbibliothek1
- Marcantonio Contarini1
- Marcantonio V Borghese1
- Marcela Gabriela1
- Marchese Linterno1
- Marchese Porri-Carcani1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marilyn Carbonell1
- Mario Maffei1
- Martin Breslauer1
- Matteo Barresi1
- Mayfair Rare Books and Manuscripts1
- Mazliah Finzi1
- Melk Abbey1
- Mercantile Library Company1
- Michael Tomkinson1