Former Owner
- Lucien Magne1
- Luigi Celotti1
- Luigi Serra di Cassano1
- Lyon Cathedral1
- Léon Techener1
- Mademoiselle de Malberghe1
- Maffeo Pinelli1
- Manuel John Johnson1
- Margaret F. Woodward1
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Martinus Nijhoff1
- Marvin-L. Colker1
- Mary Bloch1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Maurice Kann1
- Mayfair Rare Books and Manuscripts1
- Merlemont family1
- Meschatin La Faye family1