| 1965 USAC Championship Car season | |
|---|---|
| USAC National Championship Trail | |
| Season | |
| Races | 18 |
| Start date | March 28 |
| End date | November 21 |
| Awards | |
| National champion |  Mario Andretti |
| Indianapolis 500 winner |  Jim Clark |
The 1965 USAC Championship Car season consisted of 18 races, beginning in Avondale, Arizona on March 28 and concluding at the same location on November 21. This season was notable for the Hoosier Grand Prix, the first Championship Car event held on a road course since the 1937 Vanderbilt Cup. The USAC National Champion was Mario Andretti and the Indianapolis 500 winner was Jim Clark.