Former Owner
- Manuel Fernández del Castillo1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Margaret Barclay Wilson1
- Margaret of Croy1
- Maria Ludovica Favia del Core Borromeo1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Mark Augspürger1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Barresi1
- Matthew Bloxam1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurice Johnson1
- Maurilio Morazio1
- Mayer Sulzberger1
- Mazliah Finzi1