"Bye Bye" is a song written by American singer Mariah Carey, Johnta Austin and Mikkel S. Eriksen, and Tor Erik Hermansen for Carey's eleventh studio album, E=MC². It was produced by Carey and Stargate, and was released as the second single from the album.

The best-selling female performer of the 1990s, Mariah Carey rose to superstardom on the strength of her stunning five-octave voice; an elastic talent who moved easily from glossy ballads to hip-hop-inspired dance-pop, she earned frequent comparison to rivals Whitney Houston and Celine Dion, but did them both one better by composing all of her own material.