Former Owner
- Mary Augusta Strachey1
- Matteo Luigi Canonici8
- Maurilio Morazio1
- Mayer Sulzberger1
- Mohamed. Makiya2
- Monteles, Avraham de1
- Monteles, Yosef de1
- Morris Jastrow, Jr.1
- Muḥammad Nāfiʻ, active 18581
- Muḥammad Ṣadr al-Dīn1
- Muṣṭafa Ṣidḳī1
- Nathan Brown2
- Nathaniel Dunbar1
- Neustift Abbey1
- Nicholas Bacon1
- Nicolas Antoine Labbey de Billy1
- Norman Winestine1
- Norza, Leon1
- Novalesa Abbey1
- Oliver R. Barrett1