Barcelona say Barry will play for their Under-19 squad next season.
In a move that angered West Bromwich Albion, where he had been on the books since he was just six-years-old, the Catalan giants unveiled the 16-year-old with the blaugrana shirt and announced him as their latest addition.
PSG had also lodged an interest in Barry who underwent a medical with the French club before he changed his mind joined the Spanish champions instead.
The England wonderkid was offered a three-year contract at the Baggies, but turned down the deal in favour of a move elsewhere.
He was given a chance to impress in Barca's La Masia academy - equivalent to the U18 football while he was playing at West Brom.
"Louie Barry is an global with the English Under-16 team, for whom he has played nine games and scored seven goals", read the official statement released by Barcelona. Meanwhile, English side West Brom who previously owned the youngster, is expected to receive a fee of £235,000 as part of the transfer move.
A year ago he scored 10 goals in five games for England U15s during a tournament in Italy.
He'll play with the Juvenil A team at first and has signed a three-year contract.
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