The Wythenshawe-born Academy graduate has made 359 appearances and scored 123 goals for the club since making his debut in 2016.
He capped off a fantastic 2022/23 season, in which he scored 30 goals, by winning the Sir Matt Busby Player of the Year and Players’ Player of the Year awards.
Marcus Rashford said: “I joined Manchester United as a seven-year-old boy with a dream. That same passion, pride, and determination to succeed still drives me every time I have the honour of wearing the shirt.
“I’ve already had some amazing experiences at this incredible club, but there is still a lot more to achieve and I remain relentlessly determined to win more trophies in the years ahead.