"Bye Bye" is a song co-written by American singer Mariah Carey, Johnta Austin and Stargate for Carey's eleventh studio album, E=MC², and is the second single from the album. The single was produced by Carey and Stargate.
The song premiered on radio April 7, 2008 and has been played on various radio stations in the United States, according to Mediabase.The single became available to download at iTunes on April 14, 2008.

Carey first performed "Bye Bye" on T4 4Music and performed it again live on April 14, 2008, the single's digital release date, on The Oprah Winfrey Show and then again, two days later, on American Idol season 7 on April 16.

Carey performed the song on Good Morning America on April 25, 2008.

The single officially went for adds on April 22, 2008 on Mainstream and Rhythm/Crossover stations.

MTV stated that although the song appears to be about her deceased father, Carey "extends this song about death to be for anybody 'who just lost somebody'". Carey believed that by making "Bye Bye" more open, "everybody could kind of be healed by the song and have their own experience listening to it."

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