#1 to Infinity is the sixth compilation album by American singer and songwriter Mariah Carey. It was released by Sony Music Entertainment on May 15, 2015. It features Carey's eighteen US number-one singles on the Billboard Hot 100. A new recording called "Infinity" was released as the only single on April 27, 2015. In January 2015, the singer announced that she had signed a residency deal to perform at The Colosseum at the Caesars Palace hotel in Las Vegas in May and July 2015, and would perform all of her number-ones. As a result, she decided to re-release her first compilation, #1's, from 1998 with an updated list of subsequent chart toppers. Carey promoted the album with her #1 to Infinity residency and with live performances at the Billboard Music Awards, Jimmy Kimmel Live! and Live! with Kelly and Michael.

Following the release of Mariah Carey's fourteenth studio album, Me. I Am Mariah… The Elusive Chanteuse, in May 2014, she parted ways with her record label Def Jam Recordings, her publicist Cindi Berger and her manager Jermaine Dupri. She signed a new record contract with L.A. Reid at Epic Records (who co-executively produced Carey's tenth album The Emancipation of Mimi in 2005), sought a new publicist with Chris Chambers of the Chamber Group and hired new managers Stella Bulochnikov and Brian Sher. Writers Shirley Halperin and Andrew Hampp of Billboard attributed Carey's decision to seek new a new label and management to the low sales of Me. I Am Mariah… The Elusive Chanteuse, which at a total of 117,000 units since its release, is Carey's lowest selling album in the United States. Carey secured a multi-album record deal with Epic in January 2015, a subsidiary of Sony Music Entertainment, meaning that #1 to Infinity would be her first album since her seventh studio album Rainbow in 1999 to be released with Sony.

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