- Medici, Giuliano de', 1453-14781
- Medici, Giulio de'1
- Medici, Lorenzo de', 1449-14921
- Medici, Niccolò de'1
- Medici, Nicolo de'1
- Medici, Ottavia Altoviti1
- Medici, Piero di Lorenzo de', 1472-15031
- Medicinal plants1
- Medicine, Greek and Roman1
- Medicine, Persian1
- Medicine--Study and teaching1
- Mediterranean Region1
- Meistersinger1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Mercy1
- Metochites, Theodoros, 1270-13321
- Mexico1
- Middle East--Jerusalem (Latin Kingdom)1
- Middle East--Latin Orient1
- Mints1