| 1940 AAA Championship Car season | |
|---|---|
| AAA National Championship Trail | |
| Season | |
| Races | 3 |
| Start date | May 30 |
| End date | September 2 |
| Awards | |
| National champion |  Rex Mays |
| Indianapolis 500 winner | Wilbur Shaw |
The 1940 AAA Championship Car season consisted of three races, beginning in Speedway, Indiana on May 30 and concluding in Syracuse, New York on September 2. There was also one non-championship event in Langhorne, Pennsylvania. The AAA National Champion was Rex Mays and the Indianapolis 500 winner was Wilbur Shaw.
George Bailey died in practice at Indianapolis before the race. Lou Webb died during the season ending race at Syracuse.