1921 AAA Championship Car season

The 1921 AAA Championship Car season consisted of 20 races, beginning in Beverly Hills, California on February 27 and concluding in San Carlos, California on December 11. There was also one non-championship race. The AAA National Champion and Indianapolis 500 winner was Tommy Milton.

Alton Soules, and his riding mechanic Harry Barner, perished at the Fresno Speedway during the second race.

Schedule and results
All races running on Dirt/Brick/Board Oval.

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Final points standings
Note: Drivers had to be running at the finish to score points. Points scored by drivers sharing a ride were split according to percentage of race driven. Starters were not allowed to score points as relief drivers, if a race starter finished the race in another car, in a points scoring position, those points were awarded to the driver who had started the car. The final standings based on reference.