- Massachusetts--Northampton4
- Massachusetts--Wellesley30
- Massachusetts--Williamstown20
- Masses1
- Masses, Unaccompanied1
- Massi, Francesca1
- Materia medica5
- Materia medica, Vegetable3
- Mathematics10
- Mathematics, Arab17
- Mathematics, Greek3
- Mathematics, Jewish1
- Mathematics, Medieval1
- Mattei, Teo1
- Matteo, Bernardo di1
- Matteo, Giovanni di1
- Maurice, Saint, -approximately 2871
- Mawāqif fī ʻilm al-kalām (Ījī, ʻAḍud al-Dīn ʻAbd al-Raḥmān ibn Aḥmad)6
- Maximian, Emperor of Rome, approximately 240-3101
- Maḥbūbī, Maḥmūd ibn ʻUbayd Allāh, -1344 or 1345. Wiqāyat al-riwāyah fī masāʼil al-Hidāyah1