"What a Girl Wants" is a song by American recording artist Christina Aguilera, taken from her self-titled debut album (1999). A re-recorded version was released on November 28, 1999 by RCA Records as the second single from the album, following the commercial success of the lead single "Genie in a Bottle". The song was written by Shelly Peiken and Guy Roche. The song was completed and pitched to RCA executive Ron Fair as "What a Girl Needs" and was renamed "What a Girl Wants"; Fair later gave the track to Aguilera. A Spanish version of the song, titled "Una Mujer," was included on Aguilera's second studio album Mi Reflejo (2000).

The song was described as a pop and R&B track and had similarities to "Genie in a Bottle". The song received positive reviews from music critics, who described it as a "light" song and compared Aguilera's vocals on the track to those of Mariah Carey. Commercially, the song became her second consecutive US Billboard Hot 100 number-one single, and topped the charts in New Zealand and Spain. The single eventually earned gold certifications in countries including Australia, Belgium, Sweden and the US.

A music video was released directed by Diane Martel who had also directed her previous video for "Genie in a Bottle". The video presented Aguilera dancing in a room with female friends whilst being viewed by their boyfriends and saw a scene of her dressed as a medieval-style princess. In December 1999, the video reached pole position on the US music video chart TRL. Aguilera has performed the song at events such as the US Jingle Ball and the MTV New Year's Eve Special in 1999, as well as her tours including the 2000–01 Christina Aguilera: In Concert, the 2003 Stripped Live... on Tour, and her 2006–07 Back to Basics Tour.

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