- Kölner Dom1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Latin poetry, Medieval and modern1
- Letters, Papal1
- Lollards1
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Magnificat (Music)1
- Manicules1
- Manuel I, King of Portugal, 1469-15211
- Manuscripts, Catalan1
- Manuscripts, Italian1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Matthei, Bernardino1
- Małogoszcz (Poland)1
- Methodology1
- Michigan--Kalamazoo1
- Missions1
- Monasteries1
- Monasterio de San Jerónimo de Monte Olivete (Sant Pere de Ribes, Spain)1