- Marcus de Schepper Previous Owner
- Martin Bodmer, 1899-1971 Previous Owner
- Marvin L.Colker Previous Owner
- Maspero, Gaspare Previous Owner
- Matthäus Beger Previous Owner
- Mensing, Ant. W.M. , kunsthistoricus, 1866-1936 Previous Owner
- Mercato, Filippo (16.-17. sec.) Previous Owner
- Meringer, Rudolf, 1859-1931 Previous Owner
- Mettler, Arnold (1867-1945) Previous Owner
- Michel Guibé Previous Owner
- Modesto da Milano Previous Owner
- Molina, Giovanni Battista (17. sec.) Previous Owner
- Molinari, Giovanni Maria (Di Castelrotto (Tresa, Svizzera)) Previous Owner
- Montecassino (Monastery) Previous Owner
- Morbio, Carlo, 1811-1880 Previous Owner
- Musculus, Wolfgang, 1497-1563 Previous Owner