- Manuscripts, Italian2
- Manuscripts, Latin25
- Manuscripts, Latin (Medieval and modern)11
- Manuscripts, Medieval13
- Manuscripts, Portuguese1
- Manuscripts, Renaissance26
- Manuscripts, Spanish10
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Matthei, Bernardino1
- Małogoszcz (Poland)1
- Methodology1
- Mexico3
- Mexico--Mexico City2
- Michigan--Kalamazoo1
- Missions2
- Monasteries1
- Monasterio de San Jerónimo de Monte Olivete (Sant Pere de Ribes, Spain)1
- Monasterio de San Jerónimo de la Murtra (Badalona, Spain)1
- Monasterio de San Jerónimo del Valle de Hebrón (Barcelona, Spain)1
- Monastic and religious life1