The 2004 Sylvania 300 was a NASCAR Nextel Cup Series race held on September 19, 2004 at New Hampshire International Speedway, in Loudon, New Hampshire. Contested at 300 laps on the1.058-mile (1.703 km) speedway, it was the 27th race of the 2004 NASCAR Nextel Cup Series season. Kurt Busch of Roush Racing won the race.