Former Owner
- Martinus Nijhoff1
- Mary Elizabeth Holte1
- Mary Lusher1
- Mary Stanley, Countess of Derby1
- Mary, Queen of Scots1
- Mathias Schurer1
- Matteo Barresi1
- Matthew Bloxam1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurice Johnson1
- Maurice Kann1
- Maxwell Sommerville1
- Mayer Sulzberger1
- Mazliah Finzi1
- Mercantile Library Company1
- Michael Tomkinson1
- Michael Wodhull1
- Michaeliskonvent1
- Michel Chasles1