"The Promise" is a single by English-Irish girl group Girls Aloud, taken from their fifth studio album Out of Control (2008). The song was written by Miranda Cooper, Brian Higgins and his production team Xenomania. Influenced by Phil Spector and music of the 1960s, "The Promise" is an upbeat love song that was written to announce Girls Aloud as "a supergroup." Upon its release in October 2008, the single became Girls Aloud's fourth number one on the UK Singles Chart, continuing their six-year streak of top ten hits.

The music video is set at a drive-in movie theatre, where Girls Aloud watch themselves performing as a 1960s girl group on screen. "The Promise" was promoted through numerous live appearances, including a high-profile performance on The X Factor, and served as the opening number of 2009's Out of Control Tour. The song was praised and appreciated by most contemporary music critics, who lauded the song despite it being unusual for Girls Aloud. "The Promise" was awarded Best British Single at the 2009 Brit Awards, the group's first win at the ceremony.

"The Promise" is an homage to 1960s music, particularly Phil Spector's famous Wall of Sound technique. It has been described as "a 1960s-influenced pop gem given a contemporary Girls Aloud twist".Peter Robinson, however, noted that the song "also hinted at a mellower side of 1970s New York disco, as if it were some sort of long soundtrack from a deleted scene in Saturday Night Fever." The song is written in A major with a time signature in common time and a tempo of 88 beats per minute. The vocal range spans from G♯₃ to C₅. The chord progression varies throughout the song, but chord include E, Am, C, A, Dm, and D. "The Promise" is composed in rondo form, the chorus serving as the song's only repeated section. A key change takes place before the song's final chorus.

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