The Dons midfielder, who is the SPL's youngest-ever goalscorer, put pen to paper on a three-year deal this afternoon for an undisclosed fee, thought to be in the region of £500,000.
Wigan manager Roberto Martinez told www.wiganlatics.co.uk: "I'm excited because we're signing such a strong character and a great personality at just 19 years of age.
"Technically he's very gifted, enjoys playing in the midfield where he can cover large areas, he's very powerful off the ball and in possession is someone who can read the tempo of the game very well.
"Also you have to remember that for such a young player he's played a lot of games in the SPL at a high standard which shows his maturity."
Fyvie tweeted this evening: "Absolutely buzzing!!!", before adding in reply to all the Dons fans wishing him well: "appreciate all the messages from everyone !:)"
Aberdeen Mad wishes Fraser all the very best for his future in the game.