The Budweiser 500K was an automobile race sanctioned by CART, it was held at Riverside International Raceway in Riverside, California. The event was held from 1967 to 1969 and again from 1981 to 1983.

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. The series dropped Riverside in 1984. 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.

Season	Date	Driver	Team	Chassis	Engine	Race Distance		Race Time	Average Speed (mph)	Report	Ref
						Laps	Miles (km)
USAC Championship Car history
1967	November 26	Dan Gurney				120	312.000 (502.115)	2:48:51	107.17	Report	[2]
1968	December 1	Dan Gurney				120	312.000 (502.115)	2:42:01	111.689	Report	[3]
1969	December 7	Mario Andretti	STP Corporation	Hawk	Ford	120	312.000 (502.115)	2:50:08	105.797	Report	[4]
1970–1980	Not held
CART Indy Car World Series history
1981	August 30	Rick Mears	Team Penske	Penske	Cosworth	95	313.500 (504.529)			Report	[5]
1982	August 29	Rick Mears	Team Penske	Penske	Cosworth	95	313.500 (504.529)			Report	[6]
1983	August 29	Bobby Rahal	Truesports	March	Cosworth	95	313.500 (504.529)			Report	[7]

• 1983: Race postponed from Sunday to Monday due to rain.