X-Men vs. Street Fighter

X-Men vs. Street Fighter (known as XSF to Street Fighter fans) is an arcade game released by Capcom in 1996 and is the first game in the Marvel vs. Capcom series of fighting games. It features characters from the X-Men franchise and characters from the Street Fighter game series.

It was the first game to blend a tag team style of combat with the well-known Street Fighter gameplay, as well as incorporating elements from Capcom's previous fighting games in the Marvel Comics franchise, X-Men: Children of the Atom and Marvel Super Heroes. It was also ported to the Sega Saturn in 1997 and PlayStation in 1998. However, the tag team system was omitted from the PlayStation version due to memory limitations.

Due to insufficient beta testing, every character in this game has at least one infinite combo; ironically, it is nevertheless praised by some Street Fighter fans as being the most "fun" entry of the four Marvel vs. Capcom games for precisely this reason.