"What a Girl Wants" is a song recorded by American singer Christina Aguilera for her self-titled debut album (1999) ). The song was written by Shelly Peiken and Guy Roche and was completed and pitched to RCA Records executive Ron Fair as "What a Girl Needs"; it was renamed "What a Girl Wants" and given to Aguilera). The song was described as a pop and R&B track and had similarities to "Genie in a Bottle"). It received positive reviews from music critics, who described it as a "light" song and compared Aguileras vocals on the track to those of Mariah Carey). Commercially, the song became her second consecutive US Billboard Hot 100 number-one single, and also topped the charts in Brazil, Canada, New Zealand, and Spain; the song is recognized as the first Billboard Hot 100 number-one single of the 2000s).

The song has a music video that uses the video mix of the song, which has different arrangements and lyrics than the original album version. The song is available on various music streaming platforms such as Spotify and Apple Music).