The Budweiser 500K was an automobile race sanctioned by CART, it was held at Riverside International Raceway in Riverside, California.

From 1967 to 1969 Riverside served as the season-ending USAC championship race, the 1967 race was the last for Jim Clark in USAC before his death in April 1968.

[1] The race was replaced by the California 500 at Ontario Motor Speedway for 1970.

After Ontario Motor Speedway closed in 1980, Riverside returned in 1981 as a CART event.

Riverside County would not host another major race for Indy cars until 2024, when The Thermal Club in Thermal, California, in Riverside County, California, was announced as the host of the INDYCAR Thermal $1,000,000 Challenge.