- Leo X, Pope, 1475-15212
- Limp bindings2
- Love poetry, Latin (Medieval and modern)2
- Manuscripts, Greek2
- Maps2
- Marghīnānī, Maḥmūd ibn Aḥmad, 1156 or 1157-1219 or 1220. Muḥīṭ al-Burhānī fī al-fiqh al-Nuʻmānī.--Abridgment2
- Marriage2
- Masnavis, Persian2
- Materia medica2
- Mathematics2
- Medici, Alamanno de'2
- Medici, Alessandro de', 1510-15372
- Medici, Bernardo de'2
- Medici, Luisa de'2
- Medicine, Magic, mystic, and spagiric2
- Meditations2
- Mexico2
- Mineralogy2
- Monasticism and religious orders for women2
- Moral conditions2