- Logic, Ancient1
- Lombards1
- Lord's Supper--Catholic Church1
- Lord's Supper--Catholic Church--History of doctrines1
- Lorraine, Nicolas-François, duc de, 1609-16701
- Louis IX, King of France, 1214-12701
- Louis, Saint, Bishop of Toulouse, 1274-12971
- Love poetry, Classical1
- Love poetry, English (Middle)1
- Low German language1
- Lucan, 39-651
- Luke, Saint1
- Lunar eclipses1
- Lutheran Church1
- Lutheran Church--Controversial literature1
- Luxembourg1
- Luxeuil1
- Macaronic poetry1
- Macaronic verse1
- Maccabees1