The club encouraged fans to be in their seats 15 minutes before kick-off to cheer the former manager.
Ferguson is a revered figure at Old Trafford after his incredible 27 years in charge totally transformed the club's fortunes. I'm gradually making steps forward, doing what my surgeon tells me and the doctors tell me so, yeah, I'm really good.
The ex-Manchester United manager, 76, was admitted to the Salford Royal Hospital in May and needed emergency surgery for a brain haemorrhage and could not be in attendance for the tribute to his former player.
His last public appearance at Old Trafford was in late April, when he presented Arsene Wenger with a commemorative trophy to mark the end of his time as Arsenal manager. "It was a long time but it's great to be back". I've been looking forward to it.
"It's bound to be (an emotional day), particularly when I sit in the [directors'] box, that will obviously be something, but I'll be glad to get it over with and get the game started and enjoy it". That will be something, you know.
But Ferguson has made his long-awaited return to the Theatre of Dreams to support United in their meeting with Wolves today.
United grew in confidence after scoring and it required an acrobatic diving save by Rui Patricio deep in first half injury-time to deny Fred a second goal, this from a left-foot free-kick.
"It is fantastic news for everyone, not just for the Manchester United family, I think for everybody", Mourinho said of Ferguson's presence in the crowd.
"The number of emails and texts and personal cards to the house, it really was unbelievable".
Scholes made 718 appearances for the Red Devils, winning 11 Premier League titles and two Champions Leagues in that time.
'I'm overcome by it and overwhelmed by it.
'Believe me, without those people, who gave me such great care, I would not be sitting here today.
Speaking about his return and current health, Ferguson told MUTV : "I'm really good". It was really important to do that. It's great to be back!'