The 1983–84 USAC Championship Car season consisted of two races, beginning in Du Quoin, Illinois, on September 5, 1983, and concluding in Speedway, Indiana, on May 27, 1984. The USAC National Champion and Indianapolis 500 winner was Rick Mears. This was the last year that the Championship comprised more than one race, and the Ted Horn Memorial was the last ever Indycar race on a dirt or clay surface.
By this time, the preeminent national championship season was instead sanctioned by CART.
All races were run on Oval/Speedway courses.
| Rnd | Date | Race Name | Length | Track | Location | Type | Pole Position | Winning Driver | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | September 5, 1983 |  Ted Horn Memorial | 100miles | DuQuoin State Fairgrounds | Du Quoin, Illinois | Dirt | Gary Bettenhausen | Gary Bettenhausen | |
| 2 | May 27, 1984 | Indianapolis 500-Mile Race | 500miles | Indianapolis Motor Speedway | Speedway, Indiana | Paved | Tom Sneva | Rick Mears |
Note: Drivers not entered for the Indianapolis 500 were not eligible for points.
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