Índice A
| AAA (AG für Akkumulatoren und Automobilbau) | 1919-1922 |  Alemania |
| AAA (Ateliers d'Automobiles et d'Aviation) | 1919-1920 |  Francia |
| Aachener | 1902-1908 | Alemania |
| AAG (Allgemeine Automobil Gesellschaft) | 1900-1901 | Alemania |
| Aaglander | 2003- > | Alemania |
| Aarts | 1899-1900 |  Holanda |
| AAT | 1988- > |  USA |
| AAV | 1977- > |  Egipto |
| Abadal | 1912-1916 |  España |
| Abadal-Buick | 1917-1929 | España |
| Abag | 1921-1922 | Alemania |
| Abais | 1984-1984 |  Brasil |
| Abam | 1898-1907 | Alemania |
| Abarth | 1949-1984 |  Italia |
| Abbeille | 1906-1915 | Francia |
| Abbey | 1922-1922 |  Reino Unido |
| Abbott | 1909-1945 | USA |
| Abbot-Detroit | 1916-1918 | USA |
| ABC (Autobuggy Manufacturing) | 1906-1910 | USA |
| ABC (Arthur-Boynton Company) | 1922-1922 | USA |
| ABC (All British Engine) | 1919-1929 | Reino unido |
| ABC (Auto Body Craft) | 1969-1973 | Reno unido |
| Aberdonia | 1911-1915 | Reino Unido |
| ABF | 1918-1920 | Reino Unido |
| Abingdon (John Child Meredith) | 1902-1903 | Reino Unido |
| Abingdon (Abingdon Works) | 1922-1923 | Reino Unido |
| Able | 1920-1927 | Francia |
| Able-Eight | 1915-1920 | USA |
| ABT | 1973- > | Alemania |
| AC | 1901- > | Reino Unido |
| AC Propulsion | 1992- > | USA |
| Acabion | 2006- > |  Suiza |
| Academy | 1906-1908 | Reino Unido |
| Acadia | 1904-1904 | USA |
| Acadian | 1962-1971 |  Canada |
| ACB | 1981-1988 | Francia |
| Accellera | 1922-1922 | Reino Unido |
| Accles-Turrel | 1899-1902 | Reino Unido |
| ACE (Holding & Overall) | 1904-1904 |  Australia |
| ACE (Salmon Motors) | 1912-1914 | Reino Unido |
| ACE (Apex Motor) | 1920-1922 | USA |
| Acedo | 1941-1941 | España |
| Acoma | 1972-1984 | Francia |
| Acura | 1986- > |  Japón |
| Adams Probe | 1969-1971 | Reino Unido |
| Adler | 1899-1941 | Alemania |
| Aero | 1929-1951 |  Checoslovaquia |
| Aerocar | 1905-1908 | USA |
| AFA | 1942-1942 | España |
| AGA | 1919-1929 | Alemania |
| AIRAM | 1923-1323 | España |
| Airomobile | 1937-1938 | USA |
| Airphibian | 1946-1946 | USA |
| Aisa | 1952-1954 | España |
| Aixam | 1983- > | Francia |
| Ajax | 1925-1926 | USA |
| AJS | 1930-1933 | Reino Unido |
| Alart | 1959-1959 | Francia |
| Alba | 1913-1928 | Francia |
| Albatros (Henri Billouin) | 1906-1912 | Francia |
| Albatros (Albatros Motors) | 1922-1924 | Reino Unido |
| Albatross | 1939-1939 | USA |
| Albion | 1900-1915 | Reino Unido |
| Albisa Hugar | 1969-1972 | España |
| Alca | 1947-1949 | Italia |
| Alco | 1905-1913 | USA |
| Alcyon | 1906-1928 | Francia |
| Alda | 1912-1922 | Francia |
| Aleu | 1952-1956 | España |
| Alfa Romeo | 1909- > | Italia |
| Allard | 1936-1966 | Reino Unido |
| Alldays & Onions | 1898-1918 | Reino Unido |
| Alpine | 1955-1995 | Francia |
| Alta | 1931-1958 | Reino Unido |
| Alveras | 2001- > |  Bélgica |
| Alvis | 1919-1968 | Reino Unido |
| AMC | 1954-1987 | USA |
| American (American Automobile Company) | 1899-1899 | USA |
| American (American Motor Carriage) | 1902-1903 | USA |
| American (American Automobile Manufacturing) | 1911-1912 | USA |
| American (American Cyclecar Company) | 1914-1914 | USA |
| American (American Motor Car Company) | 1916-1924 | USA |
| American-Austin | 1930-1934 | USA |
| American Electric | 1896-1902 | USA |
| American LaFrance | 1907-1920 | USA |
| American Underslung | 1912-1914 | USA |
| Amilcar | 1921-1939 | Francia |
| Amphicar | 1961-1968 | Alemania |
| Anasagasti | 1911-1915 |  Argentina |
| Anglada | 1902-1905 | España |
| Angus Sanderson | 1919-1927 | Reino Unido |
| Ansaldo | 1919-1936 | Italia |
| Apal | 1964-1987 | Bélgica |
| Apollo | 1909-1926 | Alemania |
| Apperson | 1902-1925 | USA |
| Aptera | 2005- > | USA |
| AQC | 1968-1970 | USA |
| Aquila Italiana | 1906-1917 | Italia |
| Ardiurme | 1905-1905 | España |
| Argo (Electric Vehicle Company ) | 1911-1916 | USA |
| Argo (Argo Motor Company) | 1914-1919 | USA |
| Argonaut | 1959-1963 | USA |
| Argyll (Argyll Motors) | 1899-1932 | Reino Unido |
| Argyll (Minnow Fish Carburetters) | 1976-1986 | Reino Unido |
| Ariés | 1903-1938 | Francia |
| Armstrong Siddeley | 1919-1960 | Reino Unido |
| ARO | 1957- > |  Rumania |
| Arola | 1976-1983 | Francia |
| Arrol-Aster | 1927-1931 | Reino Unido |
| Arrol-Johnston | 1896-1931 | Reino Unido |
| Artega | 2007- > | Alemania |
| Artés | 1966-1971 | España |
| Arzens | 1924-1942 | Francia |
| AS | 1924-1928 | Francia |
| ASA | 1962-1967 | Italia |
| Asardo | 1958-1960 | USA |
| Ascari | 1995- > | Reino Unido |
| Ashley | 1955-1962 | Reino Unido |
| Asia | 1965-1999 |  Corea |
| Aspid | 2008- > | España |
| ASS | 1919-1920 | Francia |
| Aster (Ateliers de Construction Mèchanique l'Aster) | 1900-1910 | Francia |
| Aster (Aster Engineering) | 1922-1931 | Reino Unido |
| Aster (Automoción Diseño y Fabricación) | 2000-2003 | España |
| Aston Martin | 1913- > | Reino Unido |
| Atco | 1939-1948 | Reino Unido |
| ATS | 1962-1969 | Italia |
| Attica | 1964-1968 |  Grecia |
| Auburn | 1900-1937 | USA |
| Audenis | 1930-1936 | España |
| Audi | 1909- > | Alemania |
| Aurora | 1957-1957 | USA |
| Austin | 1906-1975 | Reino Unido |
| Austin-Healey | 1953-1969 | Reino Unido |
| Austro-Daimler | 1899-1936 |  Austria |
| Austro-Fiat | 1907-1936 | Austria |
| Authi | 1966-1975 | España |
| Auto-Tri | 1953-1953 | España |
| Auto Avio | 1939-1943 | Italia |
| Auto Union | 1932-1969 | Alemania |
| Autobianchi | 1955-1984 | Italia |
| Autobleu | 1953-1967 | Francia |
| Autocar | 1899-1911 | USA |
| Automirage | 1972-1985 | Italia |
| Auto-Mixte | 1905-1912 | Bélgica |
| Autopedal | 1941-1941 | España |
| Autovia | 1936-1938 | Reino Unido |
| Autozodiaco | 1968-1981 | Italia |
| Auverland | 1984- > | Francia |
| AV | 1919-1926 | Reino Unido |
| Avanti | 1963-1991 | USA |
| Avia | 1956-1957 | Checoslovaquia |
| Avions Voisin | 1919-1939 | Francia |
| Avolette | 1955-1958 | Francia |
| AWE | 1952-1956 | Alemania |
| AWS | 1971-1974 | Alemania |
| AWZ | 1955-1960 | Alemania |
