1984 IndyCar season

The 1984 IndyCar season, the sixth in the CART era of U.S. open-wheel racing, consisted of 16 races, beginning in Long Beach, California on March 31 and concluding in Las Vegas, Nevada on November 10. The PPG Indy Car World Series Drivers' Champion was Mario Andretti and the Indianapolis 500 winner was Rick Mears. Rookie of the Year was Roberto Guerrero. The 68th Indianapolis 500 was sanctioned by the USAC, but counted in the CART points standings.

Drivers and constructors
The following teams and drivers competed for the 1984 CART World Series.

Grands Prix
{{legend|#FFFFFF|Oval/Speedway|border=solid 1px #AAAAAA}} {{legend|#D0E7FF|Road Course/Street Circuit|border=solid 1px #AAAAAA}}
 * Indianapolis was USAC-sanctioned but counted towards the CART title.

Nation's Cup
Best result in each race counts towards the nation's cup.