Former Owner
- Mannucci family1
- Marcantonio V Borghese1
- Marchese Porri-Carcani1
- Marco Antonio Morosini1
- Margaret Barclay Wilson1
- Margaret Le Seigneur1
- Margaret of Croy1
- Marguerite de Belleville1
- Marguerite de Fontenay1
- Marguerite of Lorraine1
- Marie Ange-Toussaint Placide de Ferron1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marienstiftsgymnasium1
- Marino Grimani1
- Mario Maffei1
- Marion Lawrence1
- Mark Lansburgh1
- Martin Schøyen1