Former Owner
- Libreria la Bibliofila1
- Lionardo di Paolo Adimari1
- Louis Herbert Gray1
- Ludovico Settala1
- Luther Albertus Brewer1
- Madeleine Cosman1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Malachia Ormanian1
- Manuel Fernández del Castillo1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Manṣūr, Abū al-Faz̤l ibn Ghiyāth al-Dīn1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Mark Sittich von Hohenems Altemps1
- Markus Fugger1
- Mary Augusta Strachey1
- Matthaeus Lupin1
- Maximilian Henry of Bavaria1
- Mazliah Finzi1