- Manuscripts, Thai1
- Manuscripts, Turkish14
- Manuscripts, Urdu1
- Marginalia14
- Maritime1
- Mark, Saint1
- Marriage2
- Marriage (Canon law)1
- Mary Magdalene, Saint1
- Mary, Blessed Virgin, Saint25
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mashāriq al-anwār (Ṣaghānī, al-Ḥasan ibn Muḥammad)1
- Massachusetts--Boston154
- Massachusetts--Williamstown10
- Mawāqif fī ʻilm al-kalām (Ījī, ʻAḍud al-Dīn ʻAbd al-Raḥmān ibn Aḥmad)1
- Medallions (Decorative arts)1
- Medical astrology1
- Medicine5
- Medicine, Arab3
- Medicine, Greek and Roman--Manuscripts1