- Massachusetts--Wellesley1
- Massachusetts--Williamstown5
- Mathematics, Arab1
- Mathematics, Greek2
- Matsliaḥ, ha-Kohen, 12th century2
- Maurice, Saint, -approximately 2871
- Maximus, of Turin, Saint, active 4th century-5th century1
- Maḥzor. Shavuot1
- Medicine2
- Medicine, Arab4
- Medicine, Greek and Roman1
- Meteorology1
- Methodism (Ancient medicine)1
- Mevorakh ben Saadiah, active 11th century1
- Michael (Archangel)1
- Michigan--Kalamazoo9
- Middle Ages2
- Middle East--Jerusalem2
- Middle East--Jerusalem--Temple Mount1
- Midrash2