2003 Interstate Batteries 400

The 2003 Interstate Batteries 400 was the 28th race of the 2003 NASCAR Winston Cup Series season. It was the second race at the Dover International Speedway during the season and once again the pole sitting car dominated the race. Mark Martin won the pole with a 22.146-second lap and led 117 of the 120 laps during the race.

The win for Martin was his fourth victory of the Winston Cup season, becoming the first four-time winner of the 2003 season.