- Medici, Raffaele de'1
- Medicine--Formulae, receipts, prescriptions1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Mensural notation1
- Mexico1
- Michele, Lorenzo de'1
- Michele, Olivo di1
- Military religious orders1
- Miscellanea1
- Miserere1
- Missions1
- Monardes, Nicolás, approximately 1512-15881
- Monastic and religious life1
- Monastic and religious life of women1
- Monastic libraries1
- Monasticism and religious orders for women1
- Monte, Leonora Concini, marchesa di1
- Montserrat (Abbey)1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Motets1