The 2021 NXT The Great American Bash was the ninth Great American Bash professional wrestling event produced by WWE, and 23rd Great American Bash event overall. It was held exclusively for wrestlers from the promotion's NXT brand division. The event aired as a special episode of WWE's weekly television series NXT, broadcast on the USA Network. Unlike the previous year, which aired as a two-part event, the 2021 event was a one-night event that took place on July 6, 2021, at the Capitol Wrestling Center, hosted at the WWE Performance Center in Orlando, Florida. This was the second Great American Bash to air as an annual television special of NXT.

Kyle Richard Thomas Greenwood is a Canadian professional wrestler currently signed to All Elite Wrestling (AEW) where he performs under the ring name Kyle O'Reilly. He is also known for working in Ring of Honor (ROH) from 2009 to 2017, and WWE from 2017 to 2021, using the same ring name in both companies. He is a record three-time NXT Tag Team Champion, and was a founding member of The Undisputed Era.