Former Owner
- Manuel Fernández del Castillo2
- Manūchihr Nukhastīn Āṣaf Qājār1
- Manṣūr, Abū al-Faz̤l ibn Ghiyāth al-Dīn1
- Marc-René de Voyer d'Argenson1
- Marcus Jastrow15
- Margaret Barclay Wilson1
- Margaret of Croy1
- Maria Ludovica Favia del Core Borromeo1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Mark Augspürger1
- Mark Lansburgh2
- Mark Sittich von Hohenems Altemps1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Mary W. T. Dickinson5
- Matteo Barresi1
- Matteo Luigi Canonici6