Neither membership has publicly commented on the switch price, however the deal is broadly reported to be price $97 million.
Maguire, who has made 20 worldwide appearances for England, turns into Ole Gunnar Solskjaer’s third signing of the switch window alongside winger Daniel James and right-back Aaron Wan-Bissaka.
The central defender has signed a six-year deal at United, which completed sixth in Solskjaer’s first season with the membership.
“I’m delighted to have signed for this nice membership,” stated Maguire, who made 76 appearances for Leicester.
“I’ve totally loved my time at Leicester and wish to thank everybody on the membership, and the followers, for his or her incredible assist over the previous two seasons. Nevertheless, when Manchester United come knocking in your door, it’s an unbelievable alternative.
“From my conversations with the supervisor, I’m excited concerning the imaginative and prescient and plans he has for the staff. It is clear to see that Ole is constructing a staff to win trophies. I’m now trying ahead to assembly my new teammates and getting the season began.”
The 26-year-old, who is robust within the air and good with the ball at his toes, will look to shore up a protection that shipped 54 objectives within the Premier League final season — greater than champions Manchester Metropolis and second-placed Liverpool mixed.
“Harry is without doubt one of the finest heart backs within the recreation at present and I’m delighted we’ve secured his signature,” stated Solskjaer.
“He is a good reader of the sport and has a powerful presence on the pitch, with the flexibility to stay calm below stress — coupled together with his composure on the ball and an enormous presence in each bins — I can see he’ll match effectively into this group each on and off the pitch.”
United begins its new marketing campaign at house to Chelsea this Sunday.