X3

X3 may refer to:

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

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

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

 * X3, the mathematical cubic function

Aircraft

 * Douglas X-3 Stiletto, an experimental jet aircraft
 * Eurocopter X3, an experimental compound helicopter under development by Eurocopter

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

Graffiti

 * X3(Suffix) is a common Gang tag Signature that is associated with the Mexican Mafia aka "La Eme" x3 is the notion of Roman Numeral 10 + 3 which is 13 for the Letter M; that is the thirteenth Letter of the Spanish and English Alphabets. Every allianced gang will include Some form or variant of the x3 or 13 in their Graffiti tagging.