| Driver | Nationality | Years Active |
| George Abell | USA | 1927 |
| Jay Abney | USA | 1956 |
| Ken Acheson | GBR | 1984 |
| Art Adair | USA | 1939 |
| Tony Adamowicz | USA | 1970-71 |
| Bert Adams | USA | 1911 |
| Carl Adams | USA | 1970 |
| F. L. Adams | USA | 1913 |
| George Adams | USA | 1916 |
| Jim Adams | USA | 1966 |
| Joe Adas | USA | 1950 |
Walt Ader 
|
USA | 1946-48, 50 |
| Bobby Adkins | USA | 1981 |
| Fred
Agabashian
|
USA | 1947-58 |
| Frank Agan | USA | 1911 |
| Emil Agraz | USA | 1916 |
| A. C. Aiken | USA | 1932 |
| George Ainslee | USA | 1912 |
| Johnny
Aitken
|
USA | 1909-11, 15-16 |
| Pietro Alberti | USA | 1939 |
| Bill Albertson | USA | 1922, 28-30 |
| Michele Alboreto | ITA | 1996 |
| Mark Alderson | USA | 1981-84 |
| Bill Aldridge | USA | 1915 |
| Mikhail Aleshin | RUS | 2014-17 |
| Jean Alesi | FRA | 2012 |
| H. F. Alexander | USA | 1919 |
| Jimmy Alexander | USA | 1916 |
| W. Alexander | USA | 1913 |
| Gary Allbritain | USA | 1976 |
| Bobby Allen | USA | 1970-71, 82 |
| Leslie Allen | USA | 1927, 30 |
