Former Owner
- Long Island Historical Society, Maine1
- Louis César de La Baume Le Blanc1
- Louis XIV of France1
- Lucien Graux1
- Lucien Magne1
- Mademoiselle de Malberghe1
- Maffeo Pinelli1
- Margaret F. Woodward1
- Margaret of Croy1
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Mark Lansburgh1
- Martinus Nijhoff1
- Mary, Queen of Scots1
- Maurice Kann1
- Michel de Léon1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Mikhail Golitsyn1
- Minerva Kaiser1
- Minnis, Katherine1