"The Voice Within" is a song recorded by American singer Christina Aguilera for her fourth studio album, Stripped (2002). The song was written by Aguilera and Glen Ballard, with production handled by Ballard. It is a piano-driven ballad that talks about trusting oneself and one's instincts. "The Voice Within" was released as the fifth and final single from Stripped on October 27, 2003 by RCA Records.

Upon its release, "The Voice Within" received mainly positive reviews from music critics, who called it an inspirational ballad and praised Aguilera's strong vocals on the track. Some likened the song to works by Celine Dion and Mariah Carey. Commercially, "The Voice Within" achieved moderate success on charts worldwide, peaking within the top ten of charts in several countries including Australia, Ireland, Switzerland and the United Kingdom, and it reached number 33 on the US Billboard Hot 100.

An accompanying music video for "The Voice Within" was directed by David LaChapelle. It was filmed in black and white as a one shot. The video was nominated for three MTV Video Music Awards at the 2004 ceremony. In support of Stripped, Aguilera performed the track on her two major concert tours: Justified and Stripped Tour (2002–03) and The Stripped Tour (2003). "The Voice Within" has been covered on several television talent shows.

"The Voice Within" was written by Christina Aguilera and Glen Ballard, and was produced by Ballard. The track was recorded by Scott Campbell at The Record Plant in Hollywood, Los Angeles, California and at NRG Recording Studios in North Hollywood, LA, CA, while it was mixed by Peter Mokran.Bass was performed by Mike Elizondo, while Matt Chamberlain played drums. Ballard also played guitar with John Goux, and played keyboards with Randy Kerber. Musically, "The Voice Within" is a piano-driven ballad. Composed in the key of G major, it has a moderately slow tempo of 66 beats per minute. Aguilera's vocal range on the track spans from the low-note of D₃ to the high-note of F♯₅. Her vocals on the song were described as strong and powerful by critics. Lyrically, "The Voice Within" is an inspirational song that says that one should trust one's heart and own mind, and find inner strength. The motivational lyrics include, "When there's no-one else, look inside yourself, like your oldest friend just trust the voice within". As recalled by Aguilera, "I wrote this song when I was 20, 21, and it was a time in my life when you're being pushed and pulled in so many directions."

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