But as well as the heir to the throne, another very special guest will be watching from the Royal Box, a remarkable United fan who has lived through 11 of our 12 FA Cup triumphs and much more besides.
Dr James Burt, from Bury, turns 102 this month, and has lived an incredible life worthy of a boy's-own story.
He is the oldest-surviving RAF doctor and was a medical officer at RAF Waddington and RAF Scampton from 1946-48, looking after Bomber Command and the Dambusters 617 Squadron.