- Marriage (Roman law)1
- Martini, Giovanni1
- Martini, Luca, 1980-1
- Martyrologies1
- Martyrs1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary Magdalene, Saint1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mashāriq al-anwār (Ṣaghānī, al-Ḥasan ibn Muḥammad)1
- Masses1
- Masses, Unaccompanied1
- Mas̲navī (Jalāl al-Dīn Rūmī, Maulana)1
- Mathematical recreations1
- Maurice, Saint, -approximately 2871
- Maximian, Emperor of Rome, approximately 240-3101
- Maximilian I, Holy Roman Emperor, 1459-15191
- Małogoszcz (Poland)1
- Mechanics1
- Medea, consort of Aegeus, King of Athens (Mythological character)1