Mister X or Mr. X is commonly used as a pseudonym for someone whose name is secret or unknown.

Mister X may refer to:

Comics

  • Mister X (Marvel Comics), a supervillain in the Marvel Universe
  • Mister X (Vortex), the protagonist in Dean Motter's comic book series of that title
  • The Amazing Mr X (comics), Britain's first superhero, who first appeared in The Dandy comic in 1944

Video games

  • Mr. X (Resident Evil), antagonist first appearing in the 1998 video game Resident Evil 2
  • A villain in the video game series Streets of Rage
  • The villain in the video game The Ship
  • The final villain in the video game Kung-Fu Master
  • The pseudonym of Dr. Wily in Mega Man 6
  • Xander Payne, a character from the Mega Man Archie comics
  • The pseudonym of Olga Gurlukovich during the Big Shell Incident in Metal Gear Solid 2: Sons of Liberty

Film and television

  • Mister X (1958 film), a Soviet musical film directed by Yuli Khmelnitsky
  • Mister X (1967 film), an Italian superhero film directed by Piero Vivarelli also known as Avenger X
  • Mr. X (1987 film), a Bollywood sci-fi film starring Amol Palekar directed by Khwaja Ahmad Abbas
  • Mr. X (2015 film), a Bollywood sci-fi film starring Emraan Hashmi, remake of Mr. X in Bombay (1964)
  • Mr. X (2026 film), an upcoming Indian Tamil-language spy action thriller film
  • Mr. X, a character in the 1991 Oliver Stone film, JFK.
  • Mr. X, the titular character of the 1964 Indian sci-fi film Mr. X in Bombay
  • Mr. X, a recurring puppet on The Canadian Howdy Doody Show
  • Mr. X, a recurring arch-criminal of comic Arabic films played by Fouad el-Mohandes
  • Mr. X, in the animated series The X's
  • Mr. X, a villain in the anime series Lupin III
  • Mr. X (Simpsons), Homer's pseudonym in The Simpsons episode "The Computer Wore Menace Shoes"
  • X (The X-Files), a character in the television series The X-Files
  • The Amazing Mr. X, a.k.a. The Spiritualist, a 1948 thriller film
  • Mr. X, the main character in the 1940s and 1950s radio and TV series The Man Called X
  • Mr. X, an assassin in the 2008 film Wanted, played by David O'Hara
  • Mr. X, a character who appears in the Fringe episode "Lysergic Acid Diethylamide"
  • Mr. X, the pseudonym for Goofy in the animated short Aquamania
  • Mr. X, a Teenage Mutant Ninja Turtles character associated with Mondo Gecko
  • The placeholder name the farmer is given when he gets amnesia in the Shaun the Sheep Movie
  • Mr. X, a secondary character in Big Time Rush
  • Mr. X (Amphibia character), a character in Amphibia
  • "Mr. X" (Amphibia episode), the character's eponymous debut episode

Music

  • Mister X (band), a street punk group from Belarus
  • "Mr X", a song by Alex Lifeson from his album Victor
  • "Mr X", a song by Ultravox from their album Vienna
  • "Mr X", a song and single by Pauline Murray And The Invisible Girls
  • Mister X, a character in the operetta Die Zirkusprinzessin (The Circus Princess) by Emmerich Kálmán
  • Mr.X, American DJ also known as Afrika Islam
  • Mr. X, mystery music composer of the film Enai Noki Paayum Thota
  • Mr. X, drummer formerly in the band The Meatmen
  • Mr. X, a character from God in Three Persons

Pseudonymous uses

  • Donald Graves (Kremlinologist) (1929–2008), U.S. State Department analyst, from the 1982 Washington Post article "The Secret Files of Mr. X"
  • George F. Kennan (1904–2005), American historian, in his essay "The Sources of Soviet Conduct"
  • Carl Sagan (1934–1996), American astronomer, in an essay on his experiences with marijuana
  • Norman Wexler (1926–1999), American screenwriter, in Bob Zmuda's Andy Kaufman Revealed
  • Gaston Defferre (1910–1986), French Politician, using this pseudonym during the 1965 Presidential Elections
  • Ben Zygier, a prisoner who was held in Israel
  • The former longtime boyfriend of American radio talk show host, Robin Quivers
  • John Mutton (Canadian politician) (born c. 1966), mayor of Clarington, Ontario, for his role in the Greenbelt scandal

Other uses

  • Mr. X (novel), a novel by Peter Straub
  • "Mr. X", nickname of American golfer Miller Barber (1931–2013)
  • Mr. X, a masked professional wrestler in the 1930s and 1940s, one of the identities of Cyclone Mackey
  • Mr. X, a masked professional wrestler in the WWF in the 1970s, one of the identities of Jerry Balisok
  • Mr. X, a masked professional wrestler in the WWF in the 1980s, one of the identities of Dan Marsh
  • Mr. X, a player character in the board game Scotland Yard and its spin-off, Mister X
  • Mister X, an alias used by Mayuka Kondō in the manga and anime series, Oniichan no Koto Nanka Zenzen Suki Janain Dakara ne!!

See also

  • Doctor X (disambiguation)
  • Miss X (disambiguation)
  • Professor X (disambiguation)
  • Nomen nescio (often abbreviated as N.N.)
  • John Doe
  • X (disambiguation)