- Maps1
- Margaret, Queen, consort of James IV, King of Scotland, 1489-15411
- Margaret, of Antioch, Saint1
- Marina, Saint1
- Marino, Giambattista, 1569-16251
- Marriage (Canon law)1
- Marriage--Moral and ethical aspects1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mary, Queen of Scots, 1542-15871
- Mass--Celebration1
- Matthias I, King of Hungary, 1443-14901
- Medici, Alessandro de', 1510-15371
- Medici, House of1
- Medicine1
- Medicine, Arab1
- Medicine, Magic, mystic, and spagiric1
- Medicine, Medieval1
- Menorah1
- Middle East1
- Middle East--Jerusalem1