A whopping 63,500 fans will be in attendance at Old Trafford to watch the two Under-18 sides face off in the final - a Youth Cup record crowd.
It will comfortably top the previous highest attendance for a Youth Cup tie when just over 38,000 saw the first leg of United's semi-final with Arsenal at the Emirates in 2017.
Aston Villa beat Liverpool 2-1 in the final last season with 4,450 in attendance at Villa Park.
Now United and Forest are ready for an historic occasion.
The Red Devils saw off Wolves to reach the final while Forest beat Chelsea 3-1.
Man United v Nottingham Forest: Date and kick-off time
The FA Youth Cup final will take place on Wednesday, May 11.
The match kicks off at 7.30pm.
Over 63,500 will be in attendance as Old Trafford plays host.
Man United v Nottingham Forest: TV channel and live stream
Fans can watch the final both on MUTV and online, either via The FA Player or as part of a Paid Online Event (POE) on Facebook for 99p.
talkSPORT will also have updates from the match throughout the evening.
Highlights will be shown on United and Forest's YouTube channels.
Man United v Nottingham Forest: What's been said?
Justin Cochrane, head of Man United's academy player development, said: "I'm looking forward to seeing how the players handle the crowd.
"It's another step in their journey - a big step in their journey - so how they handle the nerves, how they handle the crowd, how they handle a strong opposition in Nottingham Forest who have been doing very well; I'm looking forward to seeing how these players adapt in this scenario.
"They need to show that they can play in this sort of stage and this sort of arena if they want to progress and play in the Premier League for Manchester United.
"It's exciting. We're really, really looking forward to it. We want as many people to come and hopefully that [number of tickets sold] can be pushed up a bit further.
"Playing in front of a crowd of Manchester United supporters, of people from all over the UK or people that may be travelling in to watch the game, it's great for these players.
"It gives them that real matchday experience and we want players who can play on the big stage. There's no bigger stage than the Theatre of Dreams, [and] 75,000 [people].
"That's what these boys are aiming for, so if we can recreate that somehow with the supporters coming in, with some noise and some atmosphere in the stadium, that will only be good for their development."