The 2006 Sony HD 500 was a NASCAR Nextel Cup Series stock car race held on September 3, 2006 at California Speedway in Fontana, California.

Contested over 250 laps on the 2-mile (3.23 km) asphalt D-shaped oval, it was the twenty-fifth race of the 2006 NASCAR Nextel Cup Series season.

Kasey Kahne of Evernham Motorsports won the race.

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.