G4 or G.IV may refer to:

Places

  • County Route G4 (California), a county highway in Santa Clara County, California, USA
  • G4 Beijing–Hong Kong and Macau Expressway, an expressway in China
  • G4 (Taichung Metro), also known as Songzhu Station or Jiushe Station, a station under construction in the Taichung Metro

Arts, entertainment, games, media

  • G4 (American TV network), an American television channel
  • G4 (Canadian TV channel), a former Canadian television channel
  • G4 (group), a British vocal troupe
  • Grob's attack, an opening move in chess

Groups, organisations, companies

  • G4 nations, four nations that support each other's bids to become permanent members of the United Nations Security Council: Brazil, Germany, India, and Japan
  • Big Four (Western Europe), sometimes called 'G4', a group of powerful countries in Europe
  • VIP Protection Unit (Hong Kong), a unit of the Hong Kong Police Force (originally Section G, Division 4)
  • Allegiant Air, by IATA airline designator
  • G4 Racing, a Swiss auto racing team

Electrics, electronics, and computing

  • G4, a type of bi-pin lamp base (socket), a lamp fitting where the pin spacing is 4mm
  • LG G4 smartphone
  • Moto G4, a line of smartphones
  • Group 4 compression, a type of image compression used in fax machines and some image file formats

Apple Computer

  • PowerPC G4, a type of microprocessor by Freescale used by Apple
  • Power Mac G4, a series of personal computers made by Apple Inc in July 1999
  • PowerBook G4, a series of Professional notebooks made by Apple Inc in 2001
  • iMac G4, a series of personal computer made by Apple Inc in January 2002
  • Xserve G4, an Xserve server made by Apple Inc in May 2002
  • iBook G4, an iBook series of consumer notebooks in October 2003
  • Mac Mini G4, a Mac Mini series of ultracompact computer in January 2005

Science and medicine

  • G-4 (drug) (Ganesha-4), a psychedelic-related chemical compound

Vehicles

  • AEG G.IV, a German World War I heavy bomber
  • Caudron G.4, a 1915 French biplane
  • Friedrichshafen G.IV, a 1918 German medium bomber
  • Gotha G.IV, a 1916 German heavy bomber
  • Gulfstream IV, a family of private jet aircraft
  • Mahindra Alturas G4, an Indian mid-size SUV
  • Mitsubishi G4M "Betty", a World War II Japanese fast bomber
  • Mitsubishi Mirage G4, a Japanese subcompact sedan
  • Soko G-4 Super Galeb, a jet trainer/light attack jet of Yugoslav origin
  • USS G4 (SS-26), a 1914 G-class submarine of the United States Navy
  • G4-class freighter, a cargo ship design
  • LNER Class G4, a class of British steam locomotives
  • Pontiac G4, a compact car sold in Mexico

Other uses

  • G4 EA H1N1, a strain of influenza
  • G-quadruplex, a DNA secondary structure
  • Group 4 element, a class of elements on the Periodic Table
  • ATC code G04 Urologicals, a subgroup of the Anatomical Therapeutic Chemical Classification System
  • Galactic 04 (G04), a Virgin Galactic suborbital tourist spaceflight in October 2023, the first spaceflight of a Pakistani

See also

  • Group 4 (disambiguation)
  • G4S, formerly Group 4 Securicor
  • 4G (disambiguation)
  • Gang of Four (disambiguation)
  • Kamen Rider Agito: Project G4, the Kamen Rider Agito film
  • Kamen Rider G4, the movie exclusive character
  • Giv (disambiguation) <!-- because G.IV redirects here -->