G6

G6, G.VI, G.6 or G-6 may refer to:

International politics:
* Group of Six, a group of industrialized nations, now known as the G8
* G6, the six largest European Union members
* The NATO Assistant Chief-of-Staff, Information Technology

Engineering:
* G6 howitzer, a South African self-propelled howitzer
* Canon PowerShot G6, a digital camera manufactured by Canon
* Caudron G.6, a 1916 French reconnaissance aircraft
* Ford G6, an automobile manufactured by the Ford Motor Company of Australia
* Friedrichshafen G.VI, a
* Gotha G.VI, a
* HMS Pakenham (G06), a former Royal Navy warship
* Mazda G engine#G6, a piston engine made by Mazda
* Pontiac G6, an automobile manufactured by Pontiac in the United States

Other:
* G6, the third note in the whistle register
* G6 star, a subclass of G-class stars
* Group 6 of the periodic table
* The IATA designator for Guine Bissau Airlines
* G6 Flash, a brand of flash memory card for the Nintendo DS
* g6, a square on a chessboard in algebraic chess notation