The Colombian centre-back had been linked to Manchester United and Lyon as well as the Toffees this summer.
Fellow Barca bench player Andre Gomes has also chose to join the Toffees on a loan deal after consultation with Mina.
In the immortal words of one Larry David: preeeetty... preeeeetty... pretty good.More news: Allegheny County Health Department to treat for mosquitoes
Everton, who finished eighth in the Premier League last season, have always been viewed as the side most likely to mount a challenge to break into the illustrious top six.
'They are historically among the four most successful clubs in England and when I found out about the club and what the manager wanted from me, I was happy.
New Everton defender Yerry Mina says that he wants to win things with the Blues. The 23-year-old is expected to sign a five-year contract.
Late move: Barcelona defender Yerry Mina, who starred at the World Cup for Colombia, is off to Everton. "I believe I will be able to show my best as a player here".More news: Missing billions: Ex-Malaysian PM Najib Razak denies money laundering in court
Everton officials were in Barcelona on Thursday to put both players through a medical so their moves could go through ahead of the 5pm deadline for the English transfer window.
Another addition from the Nou Camp, midfielder Andre Gomes, joined on a season's loan.
Mina only joined Barca in January from Brazilian side Palmeiras. Everton always was a big option for me, especially after speaking with the coach, Marco Silva.
"Bernard is a great player, a player for the Brazilian national team, and I also followed his progress with Atletico Mineiro", Richarlison said on Wednesday.More news: Everton complete triple deal for Mina, Andre Gomes and Bernard