The 2003 Sylvania 300 was an NASCAR Winston Cup Series race held on September 14, 2003 at New Hampshire International Speedway, in Loudon, New Hampshire. Contested over 300 laps on the 1.058 mile (1.702 km) speedway, it was the 27th race of the 2003 NASCAR Winston Cup Series season. Jimmie Johnson of Hendrick Motorsports won the race.