"Bye Bye" is a song by American singer and songwriter Mariah Carey, taken from her eleventh studio album, E=MC² (2008). It was written by Carey, Mikkel S. Eriksen, Tor Erik Hermansen and Johntá Austin, and produced by the former three. It was released as the album's second single on April 15, 2008. The song is influenced by pop and R&B music genres, and features a piano and keyboard-driven melody. Lyrically, the song is a dialogue in between Carey and her deceased father throughout the verses, and a universal salute to departed loved ones on the chorus.

The song received generally positive reviews, with many critics considering it a highlight from the album. Though expected by critics to have surely become Carey's 19th chart-topping single in the United States, following the success of "Touch My Body", the track only managed to reach a peak position of number 19 on the Billboard Hot 100. In the other countries the song achieved relatively weak charting, peaking within the top ten in New Zealand, and the top-fifty in Canada, Ireland, Slovakia, and the United Kingdom.

"Bye Bye" was performed on few live televised appearances, in comparison to the large promotional boost given to "Touch My Body". Carey first performed the song on T4, followed by Good Morning America and The Oprah Winfrey Show. Carey performed "Bye Bye" for the final time on the seventh season of American Idol, where she was featured as a mentor for the top-seven week. The song's accompanying music video was directed by Justin Francis on the island of Antigua in the Caribbean. The video features behind-the-scenes footage of Carey and her then fiancé Nick Cannon, the singer promoting the album in the United Kingdom, as well as photos of several of Carey's close friends, family and past collaborators.

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