Former Owner
- Marc-René de Voyer d'Argenson1
- Margaret of Croy1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Mark Lansburgh1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Barresi1
- Matthew Bloxam1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurice Johnson1
- Maximilian Henry of Bavaria1
- Mazliah Finzi1
- Maḥmūd bin Nāṣir1
- Maḥmūd ibn al-Shaykh al-Fattāḥ1
- Melk Abbey1
- Michael Tomkinson1