G4

G4 or G.IV may refer to:

Aviation

• AEG G.IV, a German World War I heavy bomber
• Allegiant Air, by IATA airline designator
• 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
• Mitsubishi G4M "Betty", a World War II Japanese fast bomber
• Soko G-4 Super Galeb, a jet trainer/light attack jet of Yugoslav origin

Science and technology

• Group 4 element, a class of elements on the Periodic Table
• ATC code G04 Urologicals, a subgroup of the Anatomical Therapeutic Chemical Classification System
• G4, a type of bipin lamp socket
• LG G4 smartphone

Computing

• 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
• Group 4 compression, a type of image compression used in fax machines and some image file formats

Entertainment

• G4 (U.S. TV channel), a former American television channel
• G4 (Canadian TV channel), a Canadian television channel devoted to technology-related programming
• G4 (band), a British vocal troupe

Groups and organisations

• 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
• G4 (EU), a group of powerful countries in the European Union
• VIP Protection Unit, a unit of the Hong Kong Police Force (originally Section G, Division 4)

Roads

• County Route G4 (California), a county highway in Santa Clara County, California, USA
• G4 Beijing–Hong Kong–Macau Expressway, an expressway in China and Hong Kong
  • G4W Guangzhou–Macau Expressway, a spur expressway from Guangzhou to Macau

Other uses

• USS G4 (SS-26), a 1914 G-class submarine of the United States Navy
• G4 (Taichung Metro), also known as Songzhu Station or Jiushe Station, a station under construction in the Taichung Metro

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