- Lent2
- Logic, Medieval2
- Lord's Supper--Adoration2
- Lord's prayer2
- Luca, Jacopo di2
- Manuscripts, Catalan2
- Marriage law2
- Martini, Cornelia2
- Martini, Roberto2
- Materia medica, Vegetable2
- Medea, consort of Aegeus, King of Athens (Mythological character)2
- Medici, Giovanni de'2
- Medicine, Magic, mystic, and spagiric2
- Metaphysics2
- Middle East--Palestine2
- Military art and science2
- Monastic and religious life--Middle Ages2
- Montedoglio (Italy)2
- Mulakhkhaṣ fī al-hayʼah (Jaghmīnī, Maḥmūd ibn Muḥammad)2
- Music2