Former Owner
- Mary Schell Collins1
- Mary W. T. Dickinson2
- Mary, Queen of Scots1
- Merlemont family1
- Messieurs Du Trieu2
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Milton Fischmann3
- Minnis, Katherine1
- Miriam Lutcher Stark2
- Monsieur de Bel Air1
- Morot1
- N. Pauli1
- Nancy McGrath2
- Nettie Goldsmith Naumburg1
- Nicholas B. Scheetz1
- Norman H. Strouse1
- Oliver Henry Perkins2
- Oliver R. Barrett1
- Otto Ege32
- Otto Orren Fisher1