1965 USAC Championship Car season

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 ever road course race for this series. The USAC National Champion was Mario Andretti and the Indianapolis 500 winner was Jim Clark.

1965 USAC Championship Car season

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 ever road course race for this series. The USAC National Champion was Mario Andretti and the Indianapolis 500 winner was Jim Clark.