IROC IV was the fourth year of IROC competition, which took place over three weekends in 1976 and 1977. It saw the use of the Chevrolet Camaro in all races, and the schedule was held over in its entirety from IROC III. A. J. Foyt won the championship and $50,000 without winning a race for the second year in a row.
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 | Cale Yarborough |
$25,000 | NASCAR Winston Cup |
| 3 | Bobby Unser |
$23,000 | USAC Champ Car |
| 4 | Johnny Rutherford |
$20,000 | USAC Champ Car |
| 5 | Buddy Baker |
$18,000 | NASCAR Winston Cup |
| 6 | Richard Petty |
$15,000 | NASCAR Winston Cup |
| 7 | Al Holbert |
$13,000 | IMSA Camel GT |
| 8 | Al Unser |
$10,500 | USAC Champ Car |
| 9 | David PearsonAll |
$10,500 | NASCAR Winston Cup |
| 10 |  Jody Scheckter3 |
$5,000 | Formula One |
| 11 | Gordon Johncock |
$5,000 | USAC Champ Car |
| 12 |  James Hunt1 |
$5,000 | Formula One |
