Former Owner
- Marie Ange-Toussaint Placide de Ferron1
- Marion Lawrence1
- Martinus Nijhoff1
- Mary Schell Collins1
- Mary W. T. Dickinson1
- Mary, Queen of Scots1
- Merlemont family1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minnis, Katherine1
- Monsieur de Bel Air1
- Morot1
- P. Pigeot1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Paul Gottschalk1
- Paul Louis Feiss1
- Peter Arrell Brown Widener II1
- Peter Le Neve1
- Petrus Hofstede1
- Petrus Jensenius1
- Petrus Ysermans1