Former Owner
- Mario Pedro Arata1
- Marquis of Astorga1
- Martin Picker1
- Martin of Aragon1
- Marvin-L. Colker1
- Mayer Sulzberger1
- Michele Amari1
- Monasterio de El Paular1
- Monastery of Benevívere1
- Monica Franklyn1
- Moritz Dessauer1
- Muḥammad al-Raʼīs1
- Muḥammad ʻAbd al-Ḥayy ibn ʻAbd al-Kabīr al-Kinānī al-Ḥasanī1
- Ohio State University School of Music1
- Otto Orren Fisher1
- PBA Galleries1
- Poor Clares1
- Robert Dechert1
- Robert Hoe III1
- Rodrigo de Abejos1