| 1966 USAC Championship Car season | |
|---|---|
| USAC National Championship Trail | |
| Season | |
| Races | 16 |
| Start date | March 20 |
| End date | November 20 |
| Awards | |
| National champion |  Mario Andretti |
| Indianapolis 500 winner |  Graham Hill |
The 1966 USAC Championship Car season consisted of 16 races, beginning in Avondale, Arizona on March 20 and concluding at the same location on November 20. There was also one non-championship event at Fuji Speedway in Japan. The USAC National Champion was Mario Andretti, and the Indianapolis 500 winner was Graham Hill. At Indianapolis, Chuck Rodee was killed while qualifying for the 1966 Indianapolis 500. Also of note was the end of the career of two time 500 and two time National Champion Rodger Ward as he ran the final three races of his IndyCar career at the start of the season which included the final IndyCar victory of his career at Trenton.