The 1990 Miller Genuine Draft 400 was the 22nd stock car race of the 1990 NASCAR Winston Cup Series season and the 33rd iteration of the event. The race was held on Sunday, September 9, 1990, in Richmond, Virginia, at Richmond International Raceway, a 0.75 miles (1.21 km) D-shaped oval. The race took the scheduled 400 laps to complete. Gambling on fuel strategy, Richard Childress Racing driver Dale Earnhardt would manage to defend the field in a final three-lap restart to the finish to take his 47th career NASCAR Winston Cup Series victory and his eighth victory of the season. To fill out the top three, Roush Racing driver Mark Martin and Hendrick Motorsports driver Darrell Waltrip would finish second and third, respectively.

The Cook Out 400 is an annual NASCAR Cup Series stock car race held at the Richmond Raceway in Richmond, Virginia, being the second of two races at the track with the first one being the Toyota Owners 400 in the spring.