Bad Girls: The climax of the movie is done in the style of the final shoot-out of The Wild Bunch, including the machine gun.
Blind Fury has two characters named Lyle and Tector.
Bull Durham: Ron Shelton has said main character Crash Davis is an Expy of Pike Bishop in that they both love something that doesn't love them back.
Gangs of New York: The scene where people are thrown through the window is a reference to the opening shoot-out of the movie.
John Milius has referenced this movie in a few movies he's written and/or directed:
In Big Wednesday, the scene where the four main characters show up at the draft office was inspired by the Team Power Walk near the climax of The Wild Bunch.
The final shoot-out in The Wind and the Lion was also inspired by the shoot-out in The Wild Bunch.
The Killer (1989): The Mexican Standoff between Jong and Ying in Jenny's apartment was inspired by the movie, as was the pep talk between them before the final shoot-out.
Pulp Fiction: The robbery at the diner at the beginning, along with the freeze-frame, is an Homage to the beginning of the film.
In the first season episode "The Harvest", Buffy tells Giles, Willow and Xander as they're going into the Bronze to fight vampires, "Don't go all Wild Bunch on me".
In the second season episode "Bad Eggs", two vampires that come to town are named Lyle and Tector.
The Wire: In the third season episode "Dead Soldiers", the shoot-out between Omar and his gang and the Barksdale gang was inspired by the shoot-out at the end of The Wild Bunch.