The Colombian centre-back had been linked to Manchester United and Lyon as well as the Toffees this summer.
The defender will leave Camp Nou despite only joining in January, but the Catalan side have included a buy-back option in the deal.
Meanwhile, midfielder Andre Gomes has joined the same side but on a one-year loan deal.
OFFICIAL STATEMENT – MINA
FC Barcelona and Everton FC have reached an agreement over the transfer of the player Yerry Mina. The English club will pay FC Barcelona 30.25 million euros plus 1.5 million euros in variables. The Club reserves the right to buy back the player.
FC Barcelona would like to publicly express their thanks to Yerry Mina for his commitment and dedication and wishes him all the best for the future.
OFFICIAL STATEMENT- GOMES
FC Barcelona and Everton FC have reached an agreement over the loan of the player André Gomes for the 2018/19 season
The English club will pay FC Barcelona 2.25 million euros for the season long loan and will also pay the player’s wages.