X Factor

X Factor may refer to:
* X-Factor (comics), the name of three comic book series published by Marvel Comics, of which the third one is still ongoing, and features a superhero team known as X-Factor Investigations;
* X-Factor (professional wrestling), a wrestling tag team led by X-Pac, and X-Pac's signature move;
* Factor X, a coagulation enzyme (the "X" stands for the Roman numeral ten);
* "XFactor", a commercial Gnutella client for Mac OS X. In television:

*"The X Factor" (TV series), a television talent show originating in the United Kingdom, spawning many national versions:
**"XSeer Al Najah", Arabian version
**"The X Factor" (Australian TV series)
**"X Factor" (Belgium)
**"El Factor X" (Colombia)
**"X Factor" (Czech Republic)
**"X Factor" (Denmark)
**"The X Factor" (Iceland)
**"X Factor" (Italy)
**"The X Factor" (Kazakhstan)
**"X Factor" (Netherlands)
**"Sekret Uspekha", Russian version
**"Factor X" (Spain)
**"The X Factor" (UK)

In music:
* "The X Factor" (album), a 1995 album by Iron Maiden
* "Richard X Presents His X-Factor Vol. 1", an album by Richard X
* "Factor X" (Ailyn album)
*"Ex-Factor", a song on Lauryn Hill's 1998 album, "The Miseducation of Lauryn Hill"

In other media:
* "Factor X" (film), an upcoming 2008 film