The 2006 Sylvania 300 was an NASCAR Nextel Cup Series race held on September 17, 2006 at New Hampshire International Speedway, in Loudon, New Hampshire. Contested at 300 laps on the 1.058-mile (1.703 km) speedway, it was the 27th race of the 2006 NASCAR Nextel Cup Series season. Kevin Harvick of Richard Childress Racing won the race.

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2006 Sylvania 300

Race details
Race 27 of 36 in the 2006 NASCAR Nextel Cup Series
2006 Sylvania 300 program cover
Date	September 17, 2006 (2006-September-17)
Location	New Hampshire International Speedway, Loudon, New Hampshire
Course	Permanent racing facility 1.058 mi (1.702 km)
Distance	300 laps, 317.4 mi (510.805 km)
Average speed	102.195 miles per hour (164.467 km/h)
Pole position
Driver	Kevin Harvick	Richard Childress Racing
Most laps led
Driver	Kevin Harvick	Richard Childress Racing
Laps	196
Winner
No. 29	Kevin Harvick	Richard Childress Racing
Television in the United States
Network	TNT
Announcers	Bill Weber, Benny Parsons, & Wally Dallenbach Jr.

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New Hampshire International Speedway is a 1.058-mile (1.703 km) oval speedway located in Loudon, New Hampshire which has hosted NASCAR racing annually since the early 1990s, as well as an IndyCar weekend and the oldest motorcycle race in North America, the Loudon Classic. Nicknamed "The Magic Mile", the speedway is often converted into a 1.6-mile (2.6 km) road course, which includes much of the oval. The track was originally the site of Bryar Motorsports Park before being purchased and redeveloped by Bob Bahre. The track is currently one of eight major NASCAR tracks owned and operated by Speedway Motorsports.

• Time of race: 3:06:21
• Average Speed: 102.195 miles per hour (164.467 km/h)
• Pole Speed: 132.282 miles per hour (212.887 km/h)
• Cautions: 10 for 47 laps
• Margin of Victory: 0.777 sec
• Lead changes: 17
• Percent of race run under caution: 15.7%
• Average green flag run: 23 laps