"U Smile" is a song performed by Canadian recording artist Justin Bieber. It was written by Jerry Duplessis, Arden Altino, and Dan August Rigo, and produced by Duplessis and Altino. According to Bieber, the song is dedicated to his special fans. The song was released as the second digital-only single from the latter half of Bieber's debut album on March 16, 2010. It was released to mainstream radio in Canada on August 9, 2010, followed by a mainstream and rhythmic release on August 24, 2010, in the United States as the album's third single there.

The song, a piano and instrument driven blue-eyed soul ballad, garnered acclaim from critics as a standout track from the album. The song charted at seventeen and twenty-seven respectively in the United States and Canada, and later charted in the United Kingdom. Bieber performed the song as an intro to "Baby" on the ninth season of American Idol and on Saturday Night Live.

In an interview with MTV News, Bieber said, "'U Smile' is one of the best songs I have ever recorded," he wrote, "It really is a throwback to the great records I listened to growing up. ... I wrote it for all my fans who got me here." Bieber explained on his Twitter that his fans "took him from a small town in Canada" to the "amazing opportunity" he is living now, and feels "grateful for everything" and "blessed" for the support. Bieber confirmed he co-wrote the track with August Rigo. He also told his fans to enjoy it as they are the ones who give him his strength in this.

In August 2010, Nick Pittsinger, a Florida-based sound artist, slowed down Bieber's song 800% to produce a 35-minute-long track. It was compared to ambient music, including the works of Sigur Rós. The track became an internet meme in mid to late 2010.

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