The X Factor is a TV music competition with several international variants.
X Factor may also refer to:
Arts and entertainment The X Factor (album), by Iron Maiden, 1995 X-Factor (comics), a group of fictional mutant superheroes X-Factor (comic book), a Marvel Comic book series The X Factor, a 1965 book by Andre Norton "Ex-Factor", a 1998 song by Lauryn Hill
Sports Dante Hall (born 1978), nicknamed the X-factor, American footballer X-Factor, or sitout facebuster, a professional wrestling move
Other uses X-factor (astrophysics), used to convert CO emission line brightness to molecular hydrogen mass X-factor, a gene mutation theory causing abnormally large hearts in horses Haemin, considered the "X factor" required for the growth of Haemophilus influenzae
See also Factor X (disambiguation) The Ex-Factor (disambiguation) Variable (mathematics)