X3 may refer to:

Arts, entertainment, and media

Films

  • X-Men: The Last Stand, also known as X3 and X-Men 3, the third film in the comic book film series
  • XXX: Return of Xander Cage, a 2017 American film directed by D. J. Caruso

Literature and publications

  • X3, a collection of three science fiction novellas by Gary A. Braunbeck

Music

  • X3 (group), a short-lived Australian girl group, circa 2000
  • X3 (album), a 2004 solo album by Japanese pop singer Aya Matsuura

Video games

  • X-Men: The Official Game, a 2006 videogame prequel to X-Men: The Last Stand
  • X³: Reunion, a space simulation computer game
  • X³: Terran Conflict, a sequel to X³: Reunion
  • X³: Albion Prelude, an addon to X³: Terran Conflict
  • Dance Dance Revolution X3, a 2011 music video game by Konami
  • Mega Man X3, a 1995 platforming game in Capcom's Mega Man X series

Electronics

Instruments

  • Korg X3, a synthesizer

Phones

  • Kyocera X3, an Android One smartphone by Kyocera
  • Mobile phone models by Nokia
  • Nokia X3-00 or Nokia X3
  • Nokia X3 Touch and Type or Nokia X3-02

Sensors

  • Foveon X3 sensor, a layered image sensor design

Mathematics, science, and technology

Astronomy

  • Cygnus X-3, a binary x-ray source in the sky

Computer science

  • X3, one former name of a subcommittee of ANSI, now International Committee for Information Technology Standards (INCITS)
  • X3 (code) aka Excess-3, a binary code also termed Stibitz code
  • XKO X3, an ERP software

Mathematics

  • X<sup>3</sup>, the mathematical cubic function

Transportation

Aircraft

  • Douglas X-3 Stiletto, an experimental jet aircraft
  • Eurocopter X3, an experimental compound helicopter

Automobiles

  • Beijing X3, a Chinese subcompact crossover SUV
  • BMW X3, a German compact SUV
  • Cowin X3, a Chinese compact SUV
  • Geely Vision X3, a Chinese subcompact crossover
  • Jingyi X3, a Chinese subcompact crossover

Bus routes

  • X3 (New York City bus)
  • X3, a Metrobus route in Washington, D.C. U.S.

IATA codes

  • TUI fly Deutschland (IATA airline designator X3 since 2007)
  • Hapag-Lloyd Express (IATA airline designator X3, 2002-2007)

Motorcycles

  • Ilmor X3 (also termed the X³), a MotoGP race motorbike

Spacecraft

  • X-3, the Prospero (satellite) launched by the UK in 1971

Trains

  • X3 (train), a Swedish train built by Alstom

Watercraft

  • HMS X3, an X-class submarine of the Royal Navy

See also

  • 3X (disambiguation)