Marita Covarrubias is a fictional character on the American science fiction television series The X-Files. She was initially introduced as an informant, leaking diplomatic information to FBI Special Agent Fox Mulder to aid his investigation of paranormal cases, dubbed X-Files. However, she was revealed to be an agent of the secretive Syndicate, although ultimately betraying that organization on several occasions. Introduced in the fourth season opener "Herrenvolk", the character remained a recurring presence until the series' finale, "The Truth".

The fourth season of the American science fiction television series The X-Files commenced airing on the Fox network in the United States on October 4, 1996, concluding on the same channel on May 18, 1997, and contained 24 episodes. Following the filming and airing of the season, production began on The X-Files feature film, which was released in 1998 following the show's fifth season.