"Bye Bye Bye" is a song by American boy band NSYNC. It was released on January 11, 2000 as the first single from their second studio album No Strings Attached. The song was written and produced by Kristian Lundin and Jake Schulze, with additional writing by Andreas Carlsson. Its lyrics describe the end of a romantic relationship; it was reported to also reference the group's separation from their manager Lou Pearlman and their record label RCA Records. This song was also featured on the 2001 American compilation album Now That's What I Call Music! 6.

"Bye Bye Bye" was a commercial success, peaking at number 4 on the U.S. Billboard Hot 100 and within the top 10 in almost every country it charted in. The song received a Grammy nomination in 2001 for Record of the Year, but lost to U2's "Beautiful Day".

"Bye Bye Bye" was written and produced by Kristian Lundin and Jake Schulze, as part of Cheiron Productions, with additional production by Andreas Carlsson. Lundin stated that it was "totally production driven" and "created from the kick and the bass up". The song was originally intended to be recorded by English boy band Five, but they rejected the song as they didn't like it.

Lyrically, "Bye Bye Bye" describes a man's desires to end a romantic relationship with a difficult significant other. During production of NSYNC's second album No Strings Attached (2000), the group sued their manager Lou Pearlman, who they alleged had been stealing their profits. This brought about allegations that the lyrics also addressed their separation from Pearlman and subsequent departure from RCA Records.

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