The 2021 Ally 400 was a NASCAR Cup Series race held on June 20, 2021, at Nashville Superspeedway in Lebanon, Tennessee.

The track was built in 2001 and is currently used for events, driving schools and GT Academy, a reality television competition.

On June 3, NASCAR confirmed the track would reopen to host a Cup race in 2021, replacing one of the two Dover dates.

[9] Hendrick Motorsport teammates William Byron & Kyle Larson were the fastest in the practice session with a time of 29.724 seconds and a speed of 161.082 mph (259.236 km/h).

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