Former Owner
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Manookjee Sorabjee Ashburner1
- Manuel Fernández del Castillo1
- Manuel John Johnson1
- Marc-René de Voyer d'Argenson1
- Marie Thomas1
- Mark Lansburgh1
- Marsden J. Perry1
- Martin Schøyen1
- Marvin-L. Colker1
- Mary Stanley, Countess of Derby1
- Mary Talbot, Countess of Shrewsbury1
- Mary, Queen of Scots1
- Matthaeus Lupin1
- Matthew Bloxam1
- Maurice Johnson1
- Maḥmūd ibn al-Shaykh al-Fattāḥ1
- Melchior Daniel Neubronner1
- Melk Abbey1
- Michael Tomkinson1