The 1958 USAC Championship Car season consisted of 13 races, beginning in Trenton, New Jersey on March 30 and concluding in Phoenix, Arizona on November 11.

The USAC National Champion was Tony Bettenhausen and the Indianapolis 500 winner was Jimmy Bryan.

Pat O'Connor lost his life in a first lap accident during the Indy 500.

Art Bisch died of injuries suffered during the race at Lakewood Speedway.

Bettenhausen became the first USAC champion without a single race win (and at the time the only one) during the season until Tom Sneva did so 20 years later.