"Monday" is the fourteenth episode of the sixth season of the science fiction television series The X-Files. It premiered on the Fox network on February 28, 1999. It was written by Vince Gilligan and John Shiban, directed by Kim Manners, and featured guest appearances by Carrie Hamilton and Darren E. Burrows. The episode is a "Monster-of-the-Week" story, unconnected to the series' wider mythology. "Monday" earned a Nielsen household rating of 10.2, being watched by 16.7 million people in its initial broadcast. The episode received positive reviews from television critics.