"One Less Lonely Girl" is a song by Canadian recording artist Justin Bieber. The song was written and produced by Bieber's mentor, Usher, as well as Ezekiel Lewis, Balewa Muhammad of The Clutch, and A-Rex duo Sean Hamilton and Hyuk Shin. It was released exclusively to iTunes as the second single from his debut release, My World on October 6, 2009, and was later released to more digital distributions and mainstream and rhythmic radio soon after.

The song was positively received, with critics commending the song's delivery and comparing it to pop-R&B songs by Chris Brown and Rihanna. It was a success in the United States and Canada, Bieber's highest peaks in the countries at sixteen and ten, respectively, until "Baby" bested the record in 2010. It also charted in the Belgium (Flanders) tip chart and in Germany within the top thirty, and also charted in Austria, Australia, and United Kingdom. The music video features Bieber attracted to a girl he sees in the laundromat, as he leads her on a scavenger hunt to win a date with her. Bieber has performed the song in a number of live appearances including the Fearless Tour, The Next Star, and Dick Clark's New Year's Rockin' Eve with Ryan Seacrest.

Regarding the concept of the song, Bieber told MTV News, "I think it's really important these girls have something so they can be one less lonely girl Bieber joked that "Lonely Girl" wasn't always the choice for his second single stating "It was either between that or 'I Love High School.'", a remix of "I Love College" by label mate, Asher Roth. "One Less Lonely Girl" was released digitally on the iTunes Store on October 6, 2009.

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