"One Time" is the debut single of Canadian recording artist Justin Bieber. It is the first single released from his debut EP, My World. It was first solicited to mainstream and rhythmic radio on May 18, 2009. It was released via digital download in the United States and Canada on July 7, 2009, and was released in several other countries during autumn 2009. An acoustic version of the song, called the "My Heart Edition" was released to iTunes on December 22, 2009. The song, moderately paced with R&B, pop, and hip-hop influences, is an ode to young love.

The song received positive reviews from critics, commending its production, vocals and quality of lyrics. The song was a commercial success, reaching the top twenty in Canada, US, Germany, United Kingdom, France and New Zealand and also charted in several other countries. The single has been certified Platinum in Canada and the United States. The accompanying music video portrays Bieber at a house party, and features his mentor, Usher and hometown friend, Ryan Butler. As of March 2017, the video had been viewed over 510 million times on the video-sharing website YouTube. Bieber performed the song in a number of live appearances including The Dome, The Next Star, and Dick Clark's New Year's Rockin' Eve with Ryan Seacrest.

The song was written for Bieber by veteran American hip-hop/R&B producer and songwriter Christopher "Tricky" Stewart, and songwriter and vocal producer Kuk Harrell for their RedZone Entertainment, as his debut single. Before they produced and wrote Bieber's debut they had penned several hits, including Beyoncé's "Single Ladies (Put A Ring On It)", Mariah Carey's "Obsessed", Fabolous's "Throw It In the Bag" and others. "One Time" was produced by Stewart and production duo The Movement, while Harrell provided vocal recording and production. The Movement also received writing credits for the song as did Thabiso Nkhereanye. Bieber recorded the song at RedZone's Triangle Sound Studios in Savannah, Georgia a few hours away from Bieber's then current home of Atlanta, Georgia. Bieber also recorded some of the track at The Boom Boom Room in Burbank, California. Mixing was done in Atlanta at Silent Sound Studios by Jaycen-Joshua Fowler and Dave Pensado.

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