Justin Drew Bieber was born on March 1, 1994, at St. Joseph's Hospital in London, Ontario, and was raised in Stratford

He is the son of Jeremy Jack Bieber and Pattie Mallette, who were never married. Mallette's mother Diane and stepfather Bruce helped her raise her son.

Bieber has three younger half-siblings; the four have the same father, Jeremy Bieber. Jeremy Bieber and his ex-girlfriend, Erin Wagner, who broke up in 2014 after seven years together, have two children, daughter Jazmyn and son Jaxon.

Jeremy married his girlfriend Chelsey in February 2018, and they have a daughter named Bay. Bieber also has a stepsister named Allie, the daughter of his stepmother.

Pattie worked a series of low-paying office jobs, raising Bieber as a single mother in low-income housing. Bieber has maintained contact with his father.

Bieber attended a French language immersion, elementary school in Stratford, the Jeanne sauve catholic school

. He graduated from high school in Stratford, the St. Michael Catholic Secondary School in 2012 with a 4.0. Growing up, he learned to play the piano, drums, guitar, and trumpet.

In early 2007, aged 12, Bieber sang Ne-Yo’s ‘’ so sick’’ for a local singing competition in Stratford and was placed second.

In the same year, Bieber busked shows in front of Avon Theatre steps with a rented guitar during tourism season.