| MAF | (D) | | | |
| Maggiora | Padua (I) | 1905 | | |
| Maico | (D) | 1956 – 1958 | | |
| Maja | (A) | 1907 – 1908 | | |
| Majocchi | Mailand (I) | 1898 – 1906 | | |
| Majola | (F) | 1911 – 1920 | | |
| Manon | | | | |
| Mannesmann | Remscheid (D) | 1923 – 1929 | | |
| Mantovani | Turin (I) | 1903 – 1906 | | |
| Marathon | (USA) | 1908 – 1915 | | |
| Marathon | (F) | 1954 – 1955 | | |
| Marauder | (GB) | 1950 – 1952 | | |
| Marchand | Piacenza (I) | 1898 – 1906 | | |
| Marcos | Luton/Bradford-on-Avon (GB) | 1958 - | | |
| Marcus | Wien (A) | 1888 ? | | |
| Marendaz | London (GB) | 1926 – 1936 | | |
| Marengo | Genau (I) | 1907 – 1909 | | |
| Marino | Padua (I) | 1923 – 1930 | | |
| Marlborough | Aubervilliers (F), London (GB) | 1906 – 1926 | | |
| Marmon | Indianapolis (USA) | 1902 – 1933 | | |
| Mars | Nürnberg (D) | 1906 – 1908 | | |
| Marta | Arad (H) | 1910 – 1914 | | |
| Martini | Frauenfeld (CH) | 1897 – 1934 | | |
| Maserati | Bologna/Modena (I) | 1926 - | | |
| Matford | Strassburg (F) | 1934 – 1947 | | |
| Mathis | Strassburg (F) | 1905 – 1950 | | |
| Matra | Romorantin (F) | 1965 – 1979 | | |
| Maudslay | (GB) | 1902 – 1923 | | |
| Maurer (Maurer-Union) | Nürnberg (D) | 1900 – 1924 | | |
| Mauser | Oberndorf (D) | 1923 – 1929 | | |
| Maxwell | (USA) | 1903 – 1923 | | |
| Maybach | Friedrichshafen (D) | 1921 – 1941 | | |
| Mazda | Hiroshima (JPN) | 1960 - | | |
| McFarlan | Connersville (USA) | 1910 – 1928 | | |
| McLaughlin | Ottawa (CDN) | 1908 – 1922 | | |
| Meldi | Turin (I) | 1927 – 1933 | | |
| Menon | Treviso (I) | 1897 – 1902 | | |
| Mentaschi | Lambrate/Mailand (I) | 1924 | | |
| Mercedes | Cannstatt (D) | 1901 – 1926 | | |
| Mercedes-Benz | Stuttgart-Untertürkheim (D) | 1926 - | | |
| Mercer | Trenton (USA) | 1910 – 1925 | | |
| Mercury | Detroit (USA) | 1938 - | | |
| Métallurgique | Marchienne-au-Pont (B) | 1898 – 1927 | | |
| Metropolitan | (USA) | 1954 – 1961 | | |
| MG | Oxford/Abingdon/Longbridge (GB) | 1923 - | | |
| Miari Giusti | Padua (I) | 1896 – 1898 | | |
| Michelotti | Turin (I) | 1959 - ca. 1993 | | |
| Miele | (D) | | | |
| Miesse | Brüssel (B) | 1896 – 1926 | | |
| MIGI | (USA) | 1976 | | |
| Miller | Los Angeles (USA) | 1915 – 1932 | | |
| Minerva | Antwerpen (B) | 1904 – 1939 | | |
| Minima | Mailand (I) | 1935 | | |
| Minimus | (D) | | | |
| Minutoli | Lucca (I) | 1902 – 1903 | | |
| Mirabilis | Turin (I) | 1906 – 1907 | | |
| Mitchell | (USA) | 1903 – 1923 | | |
| Mitsubishi | Kobe/Tokio (JPN) | 1917 - | | |
| M.M.C. | (GB) | 1897 – 1905 | | |
| MOHS | (USA) | 1967 | | |
| Mölkamp | Düsseldorf (D) | 1923 – 1926 | | |
| Moll | Chemnitz (D) | 1922 – 1923 | | |
| Monica | Balbigny (F) | 1974 | | |
| Moskvich | Russland | 1925 - aktuell | | |
| Monteverdi | Binningen/Basel (CH) | 1967 – 1995 | | |
| Montu | Alessandria (I) | 1900 | | |
| Moon | St. Louis (USA) | 1905 – 1931 | | |
| Morgan | Malvern Link (GB) | 1910 - | | |
| Morris | Oxford (GB) | 1913 - | | |
| Mors | Paris (F) | 1889 – 1956 | | |
| Moser (S.T.A.S.) | St. Aubin (CH) | | | |
| Motobloc | Bordeaux (F) | 1902 – 1930 | | |
| Motta & Baudo | Turin (I) | 1925 | | |
| Mustang | Seattle / Renton (USA) | 1947 – 1949 | | |
| Nacional Pescara | Barcelona (E) | 1929 – 1932 | | |
| Nacke | Coswig (D) | 1901 – 1913 | | |
| NAG | Berlin (D) | 1902 – 1934 | | |
| Nagant | Liège (B) | 1899 – 1927 | | |
| Napier | London (GB) | 1900 – 1924 | | |
| Nardi | Turin (I) | 1947 – 1956 | | |
| Nash | Kenosha (USA) | 1917 – 1957 | | |
| National | Indianapolis (USA) | 1900 – 1924 | | |
| Nazzaro | Turin (I) | 1911 – 1923 | | |
| Neander (Neumann-Neander) | (D) | 1928 – 1935 | | |
| Nesselsdorf | Nesselsdorf (D) | 1897 – 1919 | | |
| Nissan (Datsun) | Tokio/Osaka/Yokohama (JPN) | 1912 - | | |
| NSU | Neckarsulm (D) | 1905 – 1977 | | |
| NUG | (D) | | | |
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