Former Owner
- Manoel Pereira da Sylva1
- Manoel S. Pinto1
- Manuel Fernández del Castillo3
- Manuel John Johnson1
- Marcianus F. Rossi1
- Marilyn Carbonell2
- Mario Pedro Arata1
- Mark Augspürger1
- Mark Lansburgh1
- Markus Fugger1
- Marquis of Astorga1
- Marsden J. Perry1
- Martin J. Cooper4
- Martin Picker1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Mary Talbot, Countess of Shrewsbury1
- Mary W. T. Dickinson1
- Matteo Luigi Canonici2
- Matthaeus Lupin1