- Martino, Barone di1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Masjid al-Aqṣá (Jerusalem)1
- Massachusetts--Northampton1
- Massachusetts--Wellesley1
- Massi, Francesca1
- Materia medica1
- Materia medica, Vegetable1
- Mattei, Teo1
- Matteo, Bernardo di1
- Maydūmī, Muḥammad ibn Muḥammad, -13531
- Maḥzor1
- Maṣābīḥ al-sunnah (Baghawī, al-Ḥusayn ibn Masʻūd)1
- Mecco, Francesca di1
- Mecco, Xalento di1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical astrology1
- Medici, Alamanno de'1
- Medici, Bernardo de'1
- Medici, Giuliano de'1