The Frenchman has completed his long-awaited move to the Serie A champions from Manchester United after a protracted saga concerning his Old Trafford future
The 19-year-old had already featured for the Bianconeri in the club's 1-1 friendly draw against Benfica, but only now have the Serie A champions announced the deal.
Pogba has signed a four-year deal which will keep him at Juventus until 2016 after his contract with the Red Devils expired at the end of last season.
"I am very happy to be here, it is a real honour," he told Juventus' website. "I have been told that there is a very good standard of play and the fans support their favourites.
"I hope they take me and support me in the same way."
Pogba, an Under-19 international for France, is a product of the Le Havre youth academy, but left the French side for Manchester United in the summer of 2009.
He made his Premier League debut against Stoke City in January 2012, but he found playing opportunities very hard to come by at Old Trafford, but only lined up in three top-flight games for Sir Alex Ferguson's side.