- Lord's Supper1
- Lord's Supper--Adoration1
- Lord's Supper--Catholic Church1
- Magic--Religious aspects--Christianity1
- Manicules1
- Manners and customs1
- Manuscripts, Catalan1
- Manuscripts, English (Middle)1
- Mass--Celebration1
- Massachusetts--Williamstown1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medicine1
- Medicine, Magic, mystic, and spagiric1
- Medicine--Formulae, receipts, prescriptions1
- Mehmed II, Sultan of the Turks, 1432-14811
- Mensural notation1
- Metaphysics1
- Middle East1
- Middle East--Jerusalem1
- Miniature books1