Former Owner
- Marco Antonio Morosini1
- Marguerite de Belleville1
- Mark Lansburgh1
- Marsden J. Perry1
- Martin J. Cooper4
- Mary Stanley, Countess of Derby1
- Mary Talbot, Countess of Shrewsbury1
- Miriam Lutcher Stark6
- Miss Gostling1
- Morell Thurston1
- Mortimer Loeb Schiff1
- Mr. Hals1
- Mrs. F. W. Bartlett1
- Nicholas Herry1
- Northwich Library1
- Otto Orren Fisher1
- Perceval Lucas1
- Percy Mordaunt Barnard1
- Peter Eaton2
- Peter Le Neve1