Justin Drew Bieber is a Canadian pop/R&B singer, songwriter and actor. Bieber was discovered in 2008 by Scooter Braun, who came across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher, and then to a recording contract with Island Records offered by L.A. Reid.

Bieber's debut single, "One Time", was released in 2009 and peaked in the top ten in Canada and charted in the top thirty in several international markets. His debut release, My World, followed on November 17, 2009, and was eventually certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100. Bieber's first full studio release, My World 2.0, was released on March 23, 2010 and debuted at number one and within the top ten of several countries, and was certified platinum in the United States. It was preceded by the worldwide top-ten single, "Baby", in January 2010. The music video of "Baby" is currently ranked as the most viewed and most discussed YouTube video, and was the most disliked until being overtaken by Rebecca Black's song "Friday". Bieber followed-up the release of his debut album with his first headlining tour, the My World Tour, the remix albums My Worlds Acoustic and Never Say Never – The Remixes, and the 3D biopic-concert film Justin Bieber: Never Say Never – which had an opening weekend gross that nearly matched the record for the biggest opening weekend for a concert-film.

Throughout his rise to fame, Bieber has been nominated and awarded numerous accolades, winning Artist of the Year at the 2010 American Music Awards, and being nominated for Best New Artist and Best Pop Vocal Album at the 53rd Grammy Awards. Bieber is considered a teen idol, and has been subject to acclaim from fans, as well as criticism and controversy from matters concerning his popularity and image.

Bieber was born on March 1, 1994, in London, Ontario, and was raised in Stratford, Ontario. Bieber's mother, Patricia Lynn "Pattie" Mallette, was 18 years old when she became pregnant with her son. Mallette, who worked a series of low-paying office jobs, raised Bieber as a single mother in low-income housing. Bieber has maintained contact with his father, Jeremy Jack Bieber, who married another woman and had two children. Bieber's paternal great-grandfather was a German immigrant to Canada. His mother's ancestry is French Canadian.

During his childhood, Bieber was interested in hockey, soccer, and chess; he often kept his musical aspirations to himself. As he grew up, Bieber taught himself to play the piano, drums, guitar, and trumpet. In early 2007, when he was twelve, Bieber sang Ne-Yo's "So Sick" for a local singing competition in Stratford and placed second. Mallette posted a video of the performance on YouTube for their family and friends to see. She continued to upload videos of Bieber singing covers of various R&B songs, and Bieber's popularity on the site grew. Chris Hicks, Bieber's A&R at Island/Def Jam, explained the young artist's huge online following to HitQuarters by saying: "He was doing something different. He was an attractive white kid singing very soulful R&B hits. That set him apart immediately from anyone in his range because no one was covering or singing these kind of records. But equally important was that you believed in these songs - it was real. And you wanted to hear more."

In March 2011, Bieber confirmed that he is dating singer and actress Selena Gomez

In June 2011, Bieber was ranked number 2 on the Forbes list of Best-Paid Celebrities under 30. He is the youngest star and 1 of 7 musicians on the list raking in with $53 million earned in a 12 month period. It was confirmed that Bieber will release his second studio album Under the Mistletoe, on November 1, 2011.

Bieber is a Christian. He said he has a relationship with Jesus, talks to him and "he's the reason I'm here". Bieber's comments in a February 2011 profile in Rolling Stone sparked controversy. Asked whether a person should wait until marriage to have sex, Bieber responded, "I don't think you should have sex with anyone unless you love them." Asked about his opinion on abortion, Bieber said he doesn't "believe in abortion" and that it is "like killing a baby". When asked about abortion in cases of rape, he said, "Well, I think that's really sad, but everything happens for a reason. I don't know how that would be a reason. I guess I haven't been in that position, so I wouldn't be able to judge that." In the same interview, Bieber talked about homosexuality, stating that "It's everyone's own decision to do that. It doesn’t affect me and shouldn't affect anyone else", with Rolling Stone commenting, "It is not clear whether he intended to label homosexuality as a lifestyle choice." However, Bieber has also contributed to the It Gets Better Project, a project started in response to the suicide of Billy Lucas, a teenager who was the target of anti-gay bullying. Bieber has said he is not interested in obtaining United States citizenship, praising Canada as being "the best country in the world", citing its health care system as an example.