Marouane, 25, from Etterbeek, Belgium, joined Everton in 2008 and has made 163 starts and 10 substitute appearances for the Merseyside club, scoring 32 goals. A full Belgium international, he has 42 caps and seven goals since his international debut in 2007.
Manchester United manager David Moyes said: “I have worked with Marouane for five years and I’m delighted he has decided to join Manchester United. He is a player with great ability and strength and I think he will make a real difference to our squad.”
Marouane Fellaini said: “I am thrilled to sign for Manchester United. I have known the manager for many years now and I have a lot of respect for his way of working. When I was given the opportunity to work with him again, I jumped at the chance. I had a fantastic time at Everton and I’d like to thank all the fans and staff there for everything they have done for me. But being a Manchester United player is something that every player dreams of and I believe that I can make a real contribution to the team’s efforts to win trophies in the future.”
Fellaini, 25, was linked with a move to the Premier League champions throughout the transfer window although United`s former Everton manager David Moyes left it until just before the deadline on Monday to land one of his main transfer targets.
Belgium allowed Fellaini to delay joining up with their squad for the World Cup qualifier away to Scotland on Friday and was reported by British media to have handed in a transfer request in an effort to push through a move to United.
United had also pursued the Merseyside club`s England left back Leighton Baines but failed last month with a joint bid for the pair which Everton described as “derisory and insulting”.
Fellaini, who moved to Goodison Park from Standard Liege for 15 million pounds in 2008, had a contract until 2016.