Gill was elected unopposed, alongside seven others, for one of eight available seats for a four-year term at Friday's UEFA Congress in London.
The club's executive vice chairman Ed Woodward told ManUtd.com: "I'm delighted David has secured a place on UEFA's Executive Committee.
"He will make an excellent contribution to the shape and running of European football."
Gill will step down as the Reds' chief executive on 30 June after 10 years in charge, but will remain on the club board as a director.
More: Gill to step down at CEO