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Van Gaal celebrated Manchester United's derby day demolition of City in style by visiting a five-star Chinese restaurant in the city centre.
The Red Devils manager was spotted at oriental eatery Wings alongside wife Truus and a number of friends.
Van Gaal, who was also snapped in a selfie alongside Manchester City women's players Toni Duggan and Isobel Christiansen, earlier joked that United's win had given him a free pass to enjoy himself.
"I can go to Mr Wings because when you win you can go," he said in a post-match press conference on Sunday.
"When you lose then the fans are saying: 'What is Mr Louis van Gaal doing? Losing and he goes to the best restaurant of Manchester'.
"But now I can go. I shall go, maybe. I don't know."
United skipper Wayne Rooney promoted Wings restaurant earlier in the season.
The Red Devils' No10 is a regular visitor and has held his last two birthday parties there.
Juan Mata, Ander Herrera and Daley Blind also hit the town following United's win over City - their first in a Manchester derby in almost two-and-a-half years.
The Old Trafford club's last Premier League victory over their neighbours came courtesy of Robin van Persie's late free-kick at the Etihad in 2012 which sealed a 3-2 win.
After the game, Van Gaal said: "I was very pleased because the fans are pleased and we are playing for them. The fans have not always had a good time because started very bad. But still they were supporting, and now the results are coming back. It's great to be a supporter of Man United right now.
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