- Massaran, Isaac de1
- Massi, Francesca1
- Materia medica11
- Materia medica, Vegetable3
- Mathematical recreations1
- Mathematics20
- Mathematics, Ancient1
- Mathematics, Arab5
- Mathematics, Greek3
- Matsliaḥ, ha-Kohen, 12th century2
- Mattei, Teo1
- Matteo, Bernardo di1
- Matteo, Giovanni di1
- Matter--Religious aspects--Hinduism7
- Matthei, Bernardino1
- Matzos1
- Maurice, Saint, -approximately 2871
- Mawrid al-ẓamʼān (Kharrāz, Muḥammad ibn Muḥammad)1
- Maximian, Emperor of Rome, approximately 240-3101
- Maximilian I, Holy Roman Emperor, 1459-15191