1972 USAC Championship Car season
The 1972 USAC Championship Car season consisted of ten races, beginning in Avondale, Arizona on March 18 and concluding at the same location on November 4. The USAC National Champion was Joe Leonard and the Indianapolis 500 winner was Mark Donohue. Jim Malloy was killed at Indianapolis in practice; he was 40 years old.
After sponsoring the USAC Championship Trail in 1970–1971, Marlboro dropped out of the sport for 1972. After only two seasons as title sponsor, the company became angered when rival Viceroy was signed on to sponsor Vel's Parnelli Jones Racing, at the time dubbed the "super team" of the series. Without any exclusivity clause, managers at Marlboro deemed the situation "impractical and untenable," and abruptly quit. Marlboro would not return to Indy car racing until 1986.
Schedule and results
All races running on Oval/Speedway.| Rnd | Date | Race name | Track | Location | Pole position | Winning driver |
| 1 | March 18 | Jimmy Bryan 150 | Phoenix International Raceway | Avondale, Arizona |  Final points standingsNote: Peter Revson is not eligible for points. |