"This Is Not Happening" is the fourteenth episode of the eighth season and the 175th episode overall of the science fiction television series The X-Files. The episode first aired in the United States on February 25, 2001 on the Fox Network, and subsequently aired in the United Kingdom. It was written by executive producers Chris Carter and Frank Spotnitz, and directed by Kim Manners. The episode received a Nielsen household rating of 9.7 and was watched by 16.9 million viewers, making it the highest-rated episode of the season. "This Is Not Happening" was received positively by television critics.