X Factor may mean:

• X-Factor (comics), a Marvel comic book series
  • X-Factor Investigations, the superhero team featured in the current volume of X-Factor
• X-Factor (professional wrestling), WWE tag team/stable led by X Pac
• The X Factor (album), a 1995 album by Iron Maiden
• The X Factor (TV series), a UK reality show searching for the next big singing act
  • The X Factor (Australia), the Australian version of the show
  • The X Factor (Colombia), the Colombian version of the show
  • The X Factor, XSeer Al Najah, an Arabian version of the show
• Factor X, a coagulation enzyme
• X-Factor is also a series of Gatorade flavors