The striker has joined the Catalan giants on a long-term contract for an undisclosed fee which is thought to be around the £235,000 mark in compensation due to Barry's age and with Barcelona being an overseas club.
The youngster turned down the offer of a professional contract with West Brom to continue his football education with the famous Spanish side. "Next season he will be part of Barca's Under-19 squad", Barcelona said in a statement on Thursday.More news: Part of Manhattan plunged into darkness, utility says restoring power
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The teenager won the Golden Boot with three goals as he helped England Under-16s win Val-de-Marne, a UEFA tournament, last year.
Barcelona were joined in their interest in the 16-year-old by PSG and RB Leipzig, but confirmed his signing following his departure from The Hawthorns. He's penned a three year deal and will play for Juvenil A next season.
"Louie Barry is an worldwide with the English Under-16 team, for whom he has played nine games and scored seven goals", read the official statement released by Barcelona.