The 2005 Dodge Charger 500, the 56th running of the event, was a NASCAR Nextel Cup Series race held on May 7, 2005 at Darlington Raceway in Darlington County, South Carolina. Contested over 367 laps on the 1.366 mile (2.198 km) speedway, it was the tenth race of the 2005 NASCAR Nextel Cup season. The race was extended to 370 laps because of a green-white-checker finish. Greg Biffle of Roush Racing won the race.