| Urmo Aava | Junior World Rally Championship, World Rally Championship |
| Marcelo Abello | Grand-Am KONI Sports Car Challenge |
| Christian Abt | German Touring Car Masters |
| Mark Ackley | Grand-Am KONI Sports Car Challenge |
| Marv Acton | NASCAR Winston Cup Series |
| Bubba Adams | NASCAR Busch Grand National Series |
| Carl Adams | NASCAR Winston Cup Series |
| Rui Aguas | American Le Mans Series, Grand-Am ROLEX Sports Car Series |
| Grant Adcox | NASCAR Busch Grand National Series, NASCAR Winston Cup Series |
| Billy Adkins | NASCAR Budweiser Late Model Sportsman Series |
| Francis Affleck | NASCAR Busch Grand National Series |
| Andreas Aigner | World Rally Championship |
| Blair Aiken | NASCAR Winston Cup Series |
| Subhan Aksa | World Rally Championship |
| Evgeny Aksakov | World Rally Championship |
| Khalid Al Qassimi | World Rally Championship |
| Nasser Al-Attiyah | World Rally Championship |
| Christijan Albers | American Le Mans Series, Deutsche Tourenwagen Masters, Formula 1 |
| Jean-Marc Alcaraz | Canadian Touring Car Championship |
| Jean Alesi | Formula 1 |
| Diego Alessi | Grand-Am Rolex Sports Car Series |
| John Alexander | NASCAR Busch Grand National Series, NASCAR Winston Cup Series |
| Mike Alexander | NASCAR Busch Grand National Series, NASCAR Winston Cup Series |
| Matthew Alhadeff | Grand-Am KONI Sports Car Challenge, Grand-Am ROLEX Sports Car Series |
| Loy Allen | NASCAR Busch Grand National Series, NASCAR Winston Cup Series |
| Sean Allen | SPEED World Challenge GT |
| Willie Allen | NASCAR Craftsman Truck Series, NASCAR Nationwide Series |
| A.J. Allmendinger | Barber Dodge Pro Series, Champ Car Toyota Atlantic, Champ Car World Series, Formula Dodge National Championship, Grand-Am Rolex Sports Car Series, NASCAR Busch Series, NASCAR Craftsmen Truck Series, NASCAR Sprint Cup Series |
| Aric Almirola | NASCAR Busch Series, NASCAR Craftsman Truck Series, NASCAR Sprint Cup Series |
| Fernando Alonso | Formula 1 |
| Jeff Altenburg | SPEED Touring Car, SPEED World Challenge |
| Uwe Alzen | American Le Mans Series |
| Marcos Ambrose | NASCAR Nationwide Series |
| Steve Anderson | Canadian Touring Car Championship |
| Wayne Anderson | NASCAR Nextel Cup Series |
| Per-Gunnar Andersson | World Rally Championship |
| John Andretti | Grand-Am Rolex Sports Car Series, Indy Racing League, NASCAR Busch Series, NASCAR Craftsman Truck Series, NASCAR Sprint Cup Series |
| Marco Andretti | American Le Mans Series, Indy Racing League |
| Michael Andretti | Indy Racing League |
| Jay Andrew | Grand-Am KONI Sports Car Challenge |
| Max Angelelli | Grand-Am Rolex Sports Car Series |
| Sasha Anis | Canadian Touring Car Championship, Grand-Am KONI Sports Car Challenge, SPEED Touring Car |
| Andrew Aquilante | Grand-Am KONI Sports Car Challenge |
| Toshihiro Arai (Toshi Arai) |
World Rally Championship |
| Armindo Araujo | World Rally Championship |
| Tommy Archer | SPEED World Challenge |
| Ray Arlauskas | Canadian Touring Car Championship |
| Jose Armengol | Grand-Am KONI Sports Car Challenge |
| Lance Arnold | Grand-Am Rolex Sports Car Series |
| Zach Arnold | Grand-Am KONI Sports Car Challenge, Grand-Am Rolex Sports Car Series |
| Peter Aronson | Grand-Am KONI Sports Car Challenge |
| Patrick Artru | World Rally Championship |
| Lawson Aschenbach | Grand-Am KONI Sports Car Challenge, Grand-Am Rolex Sports Car Series, SPEED World Challenge |
| Brandon Ash | NASCAR Nextel Cup Series |
| Justin Ashburn | NASCAR Nationwide Series |
| Mike Asselta | Grand-Am KONI Sports Car Challenge |
| Emil Assentato | Grand-Am Rolex Sports Car Series |
| Tom Atherton | Grand-Am Rolex Sports Car Series |
| Chris Atkinson | World Rally Championship |
| Casey Atwood | NASCAR Busch Series, NASCAR Winston Cup Series |
| Bill Auberlen | American Le Mans Series, Grand-Am KONI Sports Car Challenge, Grand-Am Rolex Sports Car Series, SPEED Touring Car |
| Ben Aucott | American Le Mans Series |
| Mathieu Audette | Canadian Touring Car Championship |
| Remy Audette | Canadian Touring Car Championship |
| Michael Auriemma | Grand-Am KONI Sports Car Challenge, Grand-Am Rolex Sports Car Series |
| Didier Auriol | World Rally Championship |
| Tony Ave | NASCAR Nextel Cup Series |
| Jose Aybar | Grand-Am KONI Sports Car Challenge |
| Jerome Aymard | World Rally Championship |
