| 1905 AAA Championship Car season | |
|---|---|
| AAA National Circuit Championship | |
| Season | |
| Races | 11 |
| Start date | June 10 |
| End date | September 29 |
| Awards | |
| National champion |  Barney Oldfield |
The 1905 AAA National Motor Car Championship consisted of 11 points-paying races, beginning in The Bronx, New York on June 10 and concluding in Poughkeepsie, New York on September 29. There were also at least two non-championship events held during the year. This was the first year that the AAA Contest Board (then known as the Racing Board) officially recognized a National Champion in American Championship Car competition.
The 1905 AAA National Champion was Barney Oldfield. For reasons unclear, but likely due to a change in attitudes and opinions by AAA officials about the dangers of racing following several serious accidents, no national championship was officially recognized again until 1916.