G3, G03, G.III, G.3 or G-3 may refer to:

• G-3 (Europe), the top three economies in the European Union
• G-3 (Latin America), the grouping of Colombia, Mexico and Venezuela
• G-3, a trio of countries consisting of U.S., China and India, first proposed by chief of world economic forum, deeming these countries to be core economic and geopolitical players in this century.

• AEG G.III, a German World War I heavy bomber
• Albatros G.III, a 1916 German bomber aircraft
• Caudron G.3, a 1913 French single-engined biplane
• Friedrichshafen G.III, a 1915 German medium bomber
• G-3 U. S. Army Operations (military staff)
• G3 battlecruiser, a post First World War design for the Royal Navy that was curtailed by the Washington Naval Treaty
• G3 (NATO), the Assistant Chief Of Staff or senior staff officer on Operations and Plans at the division level and higher
• Gotha G.III, a 1916 German heavy bomber
• Heckler & Koch G3, a battle rifle produced by Heckler & Koch
• Soko G-3, improved variant of Soko G-2 airplane
• USS G-3 (SS-31), an early U.S. Navy submarine
• Group of Three, a group dispatched to Lebanon in 1958, shortly before the 1958 Lebanon crisis

• Canon PowerShot G3, a digital camera made by Canon
• G3 power state, in computer ACPI power states
• G3, a fax encoding format
• G3, a PBX from the Avaya Definity range
• Gibson G3, a 1975 bass guitar
• iAudio G3, an mp3 player from the Cowon iAudio range
• Panasonic Lumix DMC-G3, a digital interchangeable lens camera made by Panasonic
• PowerPC G3, a microprocessor branding used by Apple Computer
• LG G3, an Android smartphone developed by LG Electronics
• G3 gaming laptops series from Dell

• g3 (British magazine), a UK magazine aimed at lesbian and bisexual women
• G3 (tour), a live music show and guitar tour organized by Joe Satriani and Steve Vai
• G3: Genes, Genomes, Genetics, a scientific journal in the discipline of genetics, published by the Genetics Society of America
• GIII, the alternative title for the third and final film in the Gamera heisei trilogy.

• ATC code G03 Sex hormones and modulators of the genital system, subgroup of the Anatomical Therapeutic Chemical Classification System
• G3 star, a subclass of G-class stars in stellar classification
• Group 3 element of the periodic table
• G3 medium in embryo culture

• Galactic 03 (G03), a suborbital tourist spaceflight on 8 September 2023

• Kamen Rider G3, a fictional character featured in Kamen Rider Agito
• G3 (company), or "Good Governance Group", British corporate security and intelligence company
• G3 Ministries, Christian organization
• G-3 visa, a type of non-immigrant visa allowing travel to the United States
• G-III Apparel Group, a clothing manufacturing company
• G3 Canada, a Canadian grain company and successor to the Canadian Wheat Board

• 3G (disambiguation)
• GGG (disambiguation)

This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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