Former Owner
- Maggs Bros Ltd1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Mary W. T. Dickinson1
- Matteo Luigi Canonici1
- Maḥmūd bin Nāṣir1
- Melk Abbey1
- Monasterio de El Paular1
- Muḥammad Nāṣir al-Dawlah1
- Muḥammad al-Raʼīs1
- Muḥammad ʻAbd al-Ḥayy ibn ʻAbd al-Kabīr al-Kinānī al-Ḥasanī1
- Muṣṭafá Shāh ʻAlāʼī1
- Ochsenhausen Abbey1
- Peter Le Neve1
- Peterborough Central Library1
- Richard Graves1
- Richard Thomas Bateman1
- Robert Brodhead Honeyman1
- Robert Davies1
- Robert Wyer1
- Santi Giovanni e Paolo1