- MacDowell, Edward Alexander
- Maconchy, Elizabeth
- Mahler, Alma
- Mahler, Gustav
- Malibran, Maria Felicità
- Malotte, Albert Hay
- Manning, Richard Walter
- Manzi, Luigi
- Marcello, Benedetto Giacomo
- Marqués, Pedro Miguel
- Marschner, Heinrich August
- Marshall, Charles
- Marteau, Henri
- Martin, Easthope
- Martin, Frank
- Martini, Jean-Paul-Égide
- Marx, Joseph
- Marx, Karl
- Masarnau, Santiago de
- Mascagni, Pietro
- Massé, Victor
- Massenet, Jules
- Mattei, Tito
- Mazzaferrata, Giovanni Battista
- McDowell, Edward
- Mechem, Kirke
- Medtner, Nikolai Karlovich
- Melani, Alessandro
- Mena, Gabriel
- Menasce, Jacques de
- Mendelssohn Hensel, Fanny
- Mendelssohn, Felix
- Mercadante, Saverio
- Mercé-Fondevila, Antonio
- Messager, André
- Meyer-Helmund, Erik
- Meyerbeer, Giacomo
- Mikuli, Charles
- Milán, Luis de
- Milhaud, Darius
- Millöcker, Carl
- Mirsch, Paul
- Misón, Luis
- Mittler, Franz
- Moeran, Ernest John
- Molique, Wilhelm Bernhard
- Mompou i Dencausse, Frederic
- Monasterio, Jesús de
- Monpou, Hippolyte
- Monro, George
- Monsigny, Pierre-Alexandre
- Monteverdi, Claudio
- Moór, Emanuel
- Moore, Ben
- Moore, Douglas
- Moore, Philip
- Moral, Pablo del
- Morales, Cristóbal
- Morante, Manuel García
- Morata, Ginés de
- Moreno, Esteban
- Moretti, Federico
- Morlacchi, Francesco
- Morley, Thomas
- Moszkowski, Moritz
- Mozart, Wolfgang Amadeus
- Mudarra, Alonso de
- Mueller, Carl F.
- Myers, Gordon
