The 1970 USAC Championship Car season consisted of 18 races, beginning in Avondale, Arizona on March 28 and concluding at the same location on November 21.

The USAC National Champion and Indianapolis 500 winner was Al Unser.

After this season, dirt courses did not reappear in the USAC Championship until 1981-82.

The Pikes Peak Auto Hill Climb was the only non-championship event.

Note: Mark Donohue, Kevin Bartlett, Peter Revson, LeeRoy Yarbrough, John Cannon, Donnie Allison, Ron Grable, Jack Eiteljorg and Jack Brabham are not eligible for points.