The 2003 Auto Club 500 was a NASCAR Winston Cup Series stock car race held on April 27, 2003, at California Speedway in Fontana, California.

Contested over 250 laps on the 2-mile (3.23 km) asphalt D-shaped oval, it was the tenth race of the 2003 NASCAR Winston Cup Series season.

The track, California Speedway, was a four-turn superspeedway that was 2 miles (3.2 km) long.

Unlike the front stretch, the backstraightaway was banked at three degrees.

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