- Medici, Nicolo de'1
- Medici, Ottavia Altoviti1
- Medici, Piero di Lorenzo de', 1472-15031
- Medicine, Greek and Roman1
- Medicine--Practice1
- Medicine--Study and teaching1
- Mediterranean Region1
- Meistersinger1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Memorial books (Holocaust)1
- Menasheh ben Asher, a.b.d. ḳ. Ropshits1
- Mercy1
- Messiah--Judaism1
- Metochites, Theodoros, 1270-13321
- Mexico1
- Middle East--Jerusalem (Latin Kingdom)1
- Middle East--Latin Orient1
- Miftāḥ al-ʻulūm (Sakkākī, Yūsuf ibn Abī Bakr)1
- Mikveh1
- Military religious orders1