Former Owner
- Mary Stanley, Countess of Derby1
- Mary Talbot, Countess of Shrewsbury1
- Mary W. T. Dickinson1
- Matthew Bloxam1
- Maurice Johnson1
- Michael Greenberg1
- Miriam Lutcher Stark1
- Miss Gostling1
- Moor of Ireton1
- Morell Thurston1
- Mortimer Loeb Schiff1
- Mr. Hals1
- Nancy McGrath1
- Nathan Comfort Starr1
- Nathaniel Dunbar1
- Nell Wheeler1
- New York Academy of Medicine3
- Newman F. McGirr1
- Nicholas Bacon1
- Otto Ege14