IROC III was the third year of IROC competition, which took place over three weekends in 1975 and 1976. It saw the use of the Chevrolet Camaro in all races, and the schedule was held over in its entirety from IROC II. A. J. Foyt won the championship and $50,000 without winning a race.
The roster of drivers and final points standings were as follows; [1]
| Rank | Driver | Winnings | Series |
|---|---|---|---|
| 1 |  A. J. Foyt |
$50,000 | USAC Champ Car |
| 2 | Mario Andretti |
$25,000 | Formula One |
| 3 | Benny Parsons |
$25,000 | NASCAR Winston Cup |
| 4 | Bobby Allison |
$23,000 | NASCAR Winston Cup |
| 5 | David Pearson |
$21,000 | NASCAR Winston Cup |
| 6 | Al Unser |
$15,000 | USAC Champ Car |
| 7 | Bobby Unser |
$16,000 | USAC Champ Car |
| 8 |  Emerson Fittipaldi |
$11,000 | Formula One |
| 9 |  Brian Redman |
$10,000 | SCCA |
| 10 | Richard Petty |
$5,000 | NASCAR Winston Cup |
| 11 | James Hunt |
$5,000 | Formula One |
| 12 |  Jody Scheckter |
$5,000 | Formula One |
- ^ IROC season statistics at racing-reference.info, Retrieved March 8, 2007