| Name | Nationality | Period | Tunes |
|---|
| MacDonald, John |  | ? | 1 |
| MacDonald, Norman | | ? | 1 |
| MacDowell, Edward |  | 1860–1908 | 1 |
| Machaut, Guillaume de |  | 1300–1377 | 2 |
| MacIntyre, Duncan | | 1767–1807 | 1 |
| MacKay, Angus | | 1812–1859 | 1 |
| MacKay, John | | 1860–1925 | 1 |
| MacKenzie, John M. | | 1922–1996 | 1 |
| MacLeod, Donald | | 1917–1982 | 1 |
| MacLeod, John | | ? | 1 |
| MacLeod, Kevin | | 1972— | 1 |
| Mandak, Michael |  | 1960— | 1 |
| Marais, Marin | | 1656–1728 | 7 |
| Marcello, Alessandro |  | 1669–1747 | 3 |
| Marcello, Benedetto | | 1686–1739 | 55 |
| Marie, Jean Gabriel | | 1852–1928 | 1 |
| Marquina Narro, Pascual |  | 1873–1948 | 1 |
| Marshall, William | | 1748–1833 | 5 |
| Martini, Giovanni Battista | | 1706–1784 | 3 |
| Martini, Jean Paul |  | 1741–1816 | 2 |
| Mascagni, Pietro | | 1863–1945 | 1 |
| Mascolo, Cinthia |  | ?— | 8 |
| Mascolo, Nilson | | ?— | 8 |
| Mason, Lowell | | 1792–1872 | 4 |
| Massenet, Jules | | 1842–1912 | 3 |
| Mattheson, Johann | | 1681–1764 | 49 |
| Maybrick, Michael | | 1844–1913 | 1 |
| Mayr, Simon | | 1763–1845 | 1 |
| McCormick, Peter Dodds |  | 1834–1916 | 1 |
| McGranahan, James | | 1840–1907 | 1 |
| McKennon, Anne E. | | 1969— | 1 |
| McLachlan, Iain | | 1927–1995 | 1 |
| McLennan, George Stewart | | 1884–1929 | 2 |
| Meacham, Frank W. | | 1850–1896 | 2 |
| Meineke, Christopher | | 1782–1850 | 1 |
| Mendelssohn, Felix | | 1809–1847 | 8 |
| Mendizabal, Rosendo |  | 1868–1913 | 1 |
| Mendoza y Cortés, Quirino |  | 1862–1957 | 1 |
| Mercadante, Saverio | | 1795–1870 | 30 |
| Merkus, Paul |  | 1961— | 38 |
| Messer, Don |  | 1909–1973 | 1 |
| Metz, Theodore August | | 1848–1936 | 1 |
| Meyerbeer, Giacomo | | 1791–1864 | 1 |
| Miles, Charles Austin | | 1868–1946 | 1 |
| Millard, Virtue | | ?–1840 | 1 |
| Milne, Peter | | 1824–1908 | 1 |
| Minasi, Antonio | | 1814–1861 | 1 |
| Minkus, Ludwig | | 1826–1917 | 3 |
| Mitiku, Solomon Lulu |  | 1950— | 1 |
| Miyakawa, D. |  | 1971— | 1 |
| Molinaro, Simone | | 1570–1636 | 1 |
| Molloy, James Lyman |  | 1837–1909 | 1 |
| Monk, William Henry | | 1823–1889 | 1 |
| Montéclair, Michel Pignolet de | | 1667–1737 | 57 |
| Monti, Vittorio | | 1868–1922 | 1 |
| Montrose, Percy | | ? | 1 |
| Monzani, Tebaldo | | 1762–1839 | 12 |
| Moody, Michael Finlinson | | 1941— | 1 |
| Moore, Thomas | | 1779–1852 | 8 |
| Moran, Peter K. | | 1767–1831 | 1 |
| Morley, Thomas | | 1557–1602 | 2 |
| Moscheles, Ignaz |  | 1794–1870 | 1 |
| Motoori, Nagayo | | 1885–1945 | 1 |
| Mouquet, Jules | | 1867–1946 | 2 |
| Mouret, Jean-Joseph | | 1682–1738 | 1 |
| Mozart, Wolfgang Amadeus | | 1756–1791 | 101 |
| Muir, Alexander | | 1830–1906 | 1 |
| Muirhead, Tom | | 1900–1979 | 1 |
| Murray, James R. | | 1841–1905 | 1 |
| Mussorgsky, Modest |  | 1839–1881 | 3 |