- Martino, Odino S., active 15th century1
- Mary Magdalene, Saint1
- Mary, Blessed Virgin, Saint26
- Mary, Blessed Virgin, Saint, in the liturgy1
- Marāḥ al-arwāḥ (Ibn Masʻūd, Aḥmad ibn ʻAlī)2
- Masjid al-Aqṣá (Jerusalem)1
- Masnavis, Turkish1
- Massachusetts--Northampton1
- Massachusetts--Wellesley1
- Massachusetts--Williamstown3
- Massi, Francesca1
- Materia medica2
- Materia medica, Vegetable1
- Mathematics3
- Mathematics, Arab3
- Mathematics, Greek2
- Mattei, Teo1
- Matteo, Bernardo di1
- Mawāqif fī ʻilm al-kalām (Ījī, ʻAḍud al-Dīn ʻAbd al-Raḥmān ibn Aḥmad)1
- Maydūmī, Muḥammad ibn Muḥammad, -13531