"One Heart" is a song recorded by Canadian recording artist Celine Dion, for her eight English studio album One Heart (2003). "One Heart" was written and produced by John Shanks and Kara DioGuardi. The song is a dance-pop song, about the power of love. It was released on 16 June 2003 as the second single outside North America, while in Canada, it was released as the third single after "Have You Ever Been in Love." "One Heart" became a top 40 single in most European countries, including number 27 in the United Kingdom.

The song received favorable reviews from music critics, who deemed it as "catchy" and picked as one of the best tracks on the album. The music video for "One Heart" was directed by Antti Jokinen and released on 30 May 2003. It was included on the UK enhanced double A-side single "One Heart/I Drove All Night." The making of the video was shown on the A New Day... Live in Las Vegas bonus DVD, called One Year...One Heart. In October 2008, it was included on the European version of her My Love: Ultimate Essential Collection greatest hits.

On 15 April 2003, it was announced that after the success of "I Drove All Night," two new singles from 'One Heart' were set to impact radio. In the United States and Canada, the ballad "Have You Ever Been in Love" was selected as the next single. In Europe, the upbeat title-track "One Heart" was chosen instead. On 17 June 2003, it was announced that the song was getting some serious airplay around the world and that "One Heart" was added to radio playlists in Europe and was gaining ground at Canadian radio. The CD single for "One Heart" was available in record stores in Europe around June 2003. The track listing includes remixes of the track. The song was released in October 2003 in Japan, while it was released as a double a-side single along with "I Drove All Night", on 8 September in the UK, becoming her first double a-side release in the UK.

"One Heart" was composed and produced by John Shanks and Kara Dioguardi. It is an upbeat, dance-pop song, which draws from club-friendly house anthems, about the power of love and how determination and support can help a person through their problems.Keyboards, resembling the twinkling beats of a music box, begin the single. As it shortly plays, Dion says "one heart you are following." In the beginning, she advises to look on the bright side, with lyrics such as, "When you're down, you can start again/ Turn around anything you're in/ Love will find a place yeah." In the chorus, she says if they let their hearts lead them, they will be able to stay focused on their dream. ("If you got one heart you are followin'/One dream keeps you wondering/Love lights your way through the night/One wish keeps you tryin'/What's your silver lining/Loves lights your way through the night.") A jaunty acoustic guitar and equally cheerful drums accompany Dion in the bridge. She stresses that people have to have a dream to believe in, in lines like, "Everybody needs something to hold on to". Towards the end, she begins to wail a bit and extending some notes. At the end, she quietly says "love will find a way/love will find a way in your heart."

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