G2

G2, G02, G.II, G II, or G-2 may refer to:

Fiction

 * Transformers: Generation 2: Part of the Transformers franchise, lasting 1992-1995
 * Transformers: Generation 2 (comics), by Marvel Comics
 * G2, an android in the movie Inspector Gadget 2

Science and mathematics

 * G2, a stellar classification
 * G2 (mathematics), an exceptional Lie group
 * G2, a soil erosion model
 * G2 gas cloud, an astronomical object on a collision course with the super massive black hole at the center of the Milky Way
 * G2 phase, part of the cell cycle
 * ATC code G02 Other gynecologicals, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * Ovoglobulin G2, a protein in egg white
 * Haplogroup G2, a subclade of Haplogroup G (Y-DNA)
 * g−2, the notation for the anomalous magnetic dipole moment in physics
 * Muon g-2 experiment at Fermilab (E989)
 * g(2), degree of second order coherence in quantum optics
 * G2, an informal group of fossil bird eggs from the Gobi desert that were later named Gobioolithus major

Computing

 * Extreme-G 2, a 1998 Nintendo 64 game
 * G2, a model of PowerPC
 * Gnutella2, the P2P file sharing Network
 * HTC Hero mobile phone, aka G2 Touch
 * LG G2, an Android smartphone developed by LG Electronics
 * T-Mobile G2, an Android smartphone made by HTC for T-Mobile USA
 * Cook Codec or RealAudio G2, an audio compression method

Commerce and industry

 * G2 Crowd, a peer-to-peer review site
 * Gatorade G2, a soft drink
 * Canon PowerShot G2, a digital camera
 * Contax G2, the second Contax G camera
 * Panasonic Lumix DMC-G2, a digital camera
 * Slacker G2, a portable audio device for the Slacker music service

Transportation

 * County Route G2 (California), also known as Lawrence Expressway
 * G2 Beijing–Shanghai Expressway, China
 * Glasspar G2, a sports car
 * Grumman Gulfstream II, a business jet built
 * Fiat G.2, a 1932 Italian transport aircraft
 * Galactic 02 (G02), a suborbital tourist spaceflight on 10 August 2023 from Virgin Galactic
 * G2, the Avirex Gabon IATA airline designator
 * G2, a class of driver's license in Ontario, Canada
 * Pontiac G2, a hatchback sold in Mexico

Military

 * G2, a designation in NATO's Continental staff system, related to Military Intelligence
 * G-2 (intelligence), the United States Army unit
 * Directorate of Military Intelligence (Ireland), commonly referred to as "G2"
 * Dirección de Inteligencia, Cuba, also referred to as "G2"
 * Pindad G2, a handgun produced by Pindad
 * AEG G.II, a German World War I bomber
 * Albatros G.II, a 1916 German biplane bomber prototype
 * Friedrichshafen G.II, a 1916 German medium bomber aircraft
 * HMAS Nestor (G02), a 1940 Royal Australian Navy N-class destroyer
 * Gotha G.II, a German bomber during World War I
 * Soko G-2, a 1961 Yugoslavian two-seat aircraft
 * USS G-2 (SS-27), an American submarine

Other uses

 * G2, The Guardian weekday supplement
 * G2 Esports, a European eSports organization
 * Group of Two, a proposed informal special relationship between the United States and China
 * G-2 visa, a nonimmigrant visa which allows travel to the United States
 * G2 (rapper), the stage name of South Korean rapper Kevin Hwang
 * G2, a block of character codes in the Teletext character set
 * G2 (film), an upcoming Indian Telugu-language action spy film sequel to Goodachari