"Kill Switch" is the eleventh episode of the fifth season of the science fiction television series The X-Files. It premiered in the United States on the Fox network on February 15, 1998. It was written by William Gibson and Tom Maddox and directed by Rob Bowman. The episode is a "Monster-of-the-Week" story, unconnected to the series' wider mythology. "Kill Switch" earned a Nielsen household rating of 11.1, being watched by 18.04 million people in its initial broadcast. The episode received mostly positive reviews from television critics, with several complimenting Fox Mulder's virtual experience. The episode's name has also been said to inspire the name for the American metalcore band Killswitch Engage.

The fifth season of the science fiction television series The X-Files commenced airing on the Fox network in the United States on November 2, 1997, concluding on the same channel on May 17, 1998, and contained 20 episodes. The season was the last in Vancouver, British Columbia, Canada; subsequent episodes would be shot in Los Angeles, California. In addition, this was the first season of the show where the course of the story was planned, due to the 1998 The X-Files feature film being filmed before it, but scheduled to be released after it aired.