- Marriage--Moral and ethical aspects1
- Marriage--Religious aspects1
- Mary Magdalene, Saint2
- Mary, Blessed Virgin, Saint12
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mary, Queen of Scots, 1542-15871
- Mass--Celebration1
- Matthias I, King of Hungary, 1443-14901
- Mawāqif fī ʻilm al-kalām (Ījī, ʻAḍud al-Dīn ʻAbd al-Raḥmān ibn Aḥmad)1
- Maxims, Arabic1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medici, Alessandro de', 1510-15371
- Medici, House of1
- Medicine2
- Medicine, Arab2
- Medicine, Magic, mystic, and spagiric1
- Medicine, Medieval1
- Meditations7
- Mediterranean Region1
- Menorah1