- Medici, Raffaele de'1
- Medici, Vincenzo de'1
- Medicine, Magic, mystic, and spagiric1
- Mediterranean Region1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Meteorologica (Aristotle)1
- Mexico--Chiapas1
- Michael (Archangel)1
- Michele, Lorenzo de'1
- Michele, Olivo di1
- Middle East--Palestine1
- Military religious orders1
- Miserere1
- Missals (Service books)1
- Mnemonics1
- Molino, Gasparo1
- Monardes, Nicolás, approximately 1512-15881
- Monastic and religious life of women--Middle Ages1
- Monastic libraries1
- Monastic rules1