The 2006 GFS Marketplace 400 was a NASCAR Nextel Cup Series stock car race held on August 20, 2006, at Michigan International Speedway in Brooklyn, Michigan. Contested over 200 laps on a 2-mile (3.2 km) speedway, it was the 23rd race of the 2006 NASCAR Nextel Cup Series season. Matt Kenseth of Roush Racing won the race.

Michigan International Speedway (MIS) is a two-mile (3.2 km) moderate-banked D-shaped speedway located off U.S. Highway 12 on more than 1,400 acres (5.7 km²)^[1] approximately four-mile (6.4 km) south of the village of Brooklyn, in the scenic Irish Hills area of southeastern Michigan. The track is used primarily for NASCAR events. It is sometimes known as a "sister track" to Texas World Speedway, and was used as the basis of Auto Club Speedway. The track is owned by International Speedway Corporation (ISC). Michigan International Speedway is recognized as one of motorsports' premier facilities because of its wide racing surface and high banking (by open-wheel standards; the 18-degree banking is modest by stock car standards).

• Time of race: 2:57:39
• Average Speed: 135.097 miles per hour (217.418 km/h)
• Pole Speed: 187.936 miles per hour (302.454 km/h)
• Cautions: 10 for 36 laps
• Margin of Victory: 0.622 sec
• Lead changes: 26
• Percent of race run under caution: 18%
• Average green flag run: 14.9 laps