Former Owner
- Mark Augspürger1
- Mark Lansburgh1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Maurilio Morazio1
- Maximilian Henry of Bavaria1
- Mayer Sulzberger1
- Merlemont family1
- Michiel family1
- Moritz Joseph Johann von Dietrichstein1
- Morris Jastrow, Jr.1
- Museo Cavaleri1
- Nettie Goldsmith Naumburg1
- Neustift Abbey1
- Nicolas Antoine Labbey de Billy1
- Nicolas Moreau1
- Noël Pinelli1
- Otto Jahn1
- Otto Orren Fisher1