The 55-year-old had served as Roy Hodgson's number two during his successful spell with Fulham and now leaves Martin Jol's coaching staff to join the Three Lions setup
As Goal.com exclusively revealed on Friday morning, Lewington will leave the Cottagers at the end of the season in order to take on the role for Euro 2012.
Whether Lewington will extend his time with the England coaching setup beyond this summer's tournament in Poland and Ukraine is yet to be decided.
The pair worked together during Hodgson's time at Fulham, helping the west London club to the Europa League final and a seventh-placed Premier League finish, the club's highest in history.
Hodgson expressed his delight at the appointment, and revealed that the rest of his coaching staff have yet to be formerly approached.
He told the FA's official website: "I'm delighted that Fulham have agreed to Ray joining the England coaching staff for the summer. I know Ray well and enjoyed working with him at Craven Cottage."
Hodgson added, "He's a very good coach and the players will I'm sure enjoy working with him. We're currently finalizing the rest of the coaching staff but it's great to have Ray confirmed."
"I'd like to thank Fulham for agreeing to this."
Lewington has been with Fulham since 2005, occupying a number of roles including youth team manager and a brief spell as caretaker following the departure of Lawrie Sanchez.