The deal ends months of speculation that the young starlet might be on his way to Camp Nou.
“Manchester United has been everything in my life since I arrived here at the age of seven,” said Rashford on the club's website. “This club has shaped me, both as a player and as a person, so it is such a privilege every time I get the opportunity to wear the shirt.
“I want to thank Ole and his staff for everything they have done for me; they are the perfect group of coaches to learn from as I continue my development and look to push on to the next level.
“I will be giving everything I have to help get this club back to where it belongs and deliver the success that our fans deserve.”
— Marcus Rashford (@MarcusRashford) July 1, 2019
Rashford has made 170 appearances for the Red Devils, netting 45 goals. He scored the match-winning penalty kick against Paris Saint Germain last year that sent Man U to the quarter-finals of the Champions League.
With a considerable pay sum comes more significant responsibilities. United supporters will be looking at Rashford, now the team's fourth highest earner, to score at least 20 goals or more goals this season. International compatriot Harry Kane scored 21 league goals at the same age.