Former Owner
- John D. McKenna1
- John F. Fleming1
- Joseph Whitney1
- Joseph-Félix Allard1
- Juana I of Castile1
- Julius Hess1
- Laurentius van der Torqel1
- Louis César de La Baume Le Blanc1
- Lucien Magne1
- Léon Techener1
- Margaret F. Woodward1
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Martin Schøyen1
- Martinus Nijhoff1
- Maurice Kann1
- Mayfair Rare Books and Manuscripts1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minerva Kaiser1
- Minnis, Katherine1