- Marucelli, Francesco, 1625-17031
- Mathematics1
- Mayenne, Charles de Lorraine, Duc de, 1554-16111
- Medici, Alamanno de'1
- Medici, Bastiano de'1
- Medici, Bernardo d'Alamanno de'1
- Medici, Bernardo de'1
- Medici, Carlo Bernardo Alamanni de'1
- Medici, Elisabetta de'1
- Medici, Fernando de'1
- Medici, Giulio de'1
- Medici, Nicolo de'1
- Medicine1
- Medina, Francisco de, 1544-16151
- Middle East--Jerusalem1
- Middle East--Jerusalem (Latin Kingdom)1
- Mints1
- Monasticism and religious orders1
- Monasticism and religious orders for women1
- Monte di pietà (Florence, Italy)1