"Underneath It All" is a song by American ska band No Doubt from their fourth studio album Rock Steady (2001). It was written by the band's lead singer Gwen Stefani and David Stewart. The song features a reggae production from Sly and Robbie and guest vocals from Lady Saw. The song received mixed reviews from contemporary music critics.

No Doubt is an American rock band from Anaheim, California, formed in 1986. For most of its career, the band has consisted of vocalist and founding member Gwen Stefani, guitarist Tom Dumont, bassist Tony Kanal and drummer Adrian Young. Keyboardist Eric Stefani, Gwen's brother, was also a former member when the band started to release albums in 1992. Since the mid-1990s, trombonist Gabrial McNair and trumpeter Stephen Bradley have performed with the band as session and touring musicians.