- Lord's Supper--Catholic Church1
- Lord's Supper--Catholic Church--History of doctrines1
- Lord's prayer1
- Lorraine, Nicolas-François, duc de, 1609-16701
- Lutheran Church1
- Lutheran Church--Controversial literature1
- Luxembourg1
- Luxeuil1
- Magic1
- Magna Carta1
- Malchus, Saint1
- Manichaeism1
- Manuel I, King of Portugal, 1469-15211
- Manuscripts, Anglo-Norman1
- Manuscripts, Greek (Medieval and modern)1
- Manuscripts, Hebrew1
- Manuscripts, Nahuatl1
- Manuscripts, Portuguese1
- Maps1
- Margaret, of Antioch, Saint1