The 2021 Quaker State 400 was a NASCAR Cup Series race held on July 11, 2021, at Atlanta Motor Speedway in Hampton, Georgia.

Contested over 260 laps on the 1.54-mile-long (2.48 km) asphalt quad-oval intermediate speedway, it was the 21st race of the 2021 NASCAR Cup Series season.

1 car for Chip Ganassi Racing, held off his younger brother Kyle to secure what would ultimately be CGR's final win in NASCAR.

Rick Allen, Jeff Burton, Steve Letarte and 2004 Atlanta winner Dale Earnhardt Jr. called the race from the broadcast booth.

On pit road, PRN was manned by Alan Cavanna, Brett McMillan and Doug Turnbull.