Mud Lick is a rural unincorporated community in Monroe County, Kentucky, United States.

The community is believed to have been named for a salty stream that was frequently rendered muddy by animals drinking from it.

“Sulphur Lick” is a community name of similar origin in northeast Monroe County.

[4] An X-Files episode, "Kitten" S11 E6 (first aired February 7, 2018) takes place primarily in Mud Lick, with some scenes in Vietnam and FBI Headquarters (Virginia).

The premise is that U.S. Marines in Vietnam were exposed to a mind-altering gas, and later subjected to experiments at a facility in Mud Lick, making them see monsters and go on lethal rampages.