- Latin letters, Medieval and modern1
- Learning and scholarship1
- Leo XI, Pope, 1535-16051
- Letter writing1
- Lippomano, Luigi, 1500-15591
- Liturgics1
- Magnificat (Music)1
- Malatesta family1
- Malatesta, Sigismondo Pandolfo, signore di Rimini, 1417-14681
- Mancini, Girolamo, 1832-19241
- Manuscripts, French1
- Manuscripts, German1
- Manuscripts, Yiddish1
- Marie de Médicis, Queen, consort of Henry IV, King of France, 1573-16421
- Maritime law1
- Marriage law1
- Mary, Blessed Virgin, Saint1
- Materia medica1
- Medici, Alamanno de'1
- Medici, Carlo de'1