Former Owner
- Mariota Lyle1
- Martinus Nijhoff1
- Marvin-L. Colker1
- Mary Bloch1
- Mathias Schurer1
- Matteo Barresi1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurice Kann1
- Mayer Sulzberger1
- Mayfair Rare Books and Manuscripts1
- Melk Abbey1
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1
- Michael Wodhull1
- Michaeliskonvent1
- Michel de Léon1
- Michele Amari1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Mikhail Golitsyn1