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.