AG

A&G, AG, Ag or ag may refer to

Businesses and organizations

Adjutant general, the Army branch responsible for personnel
Administrator-General of South West Africa, the head of government in Namibia prior to independence in 1990
Aerographer's mate, a rating or specialty in the US Navy that deals with weather and oceanography
American Holland-class submarine (Amerikansky Golland), a class of Imperial Russian submarines
Army green, the color of the US Army service uniform and those of several other militaries
Attorney general, government lawyer or law enforcement officer in several legal systems
Miscellaneous Auxiliary, a hull classification for a type of US Navy support ship

A. G. Weinberger, Romanian musician and singer/songwriter
Aurela Gaçe (born 1974), Albanian singer
Adriano Goldschmied, Italian fashion designer
Adrianne Gonzalez (born 1977), American musician who goes by the stage name AG
Alex Gonzaga (born 1988), Filipina singer who sometimes uses the abbreviated nickname AG
Ariana Grande, an American musician
Showbiz and A.G., a hip-hop MC (short for "André the Giant")
A. G. Cook, a British pop music producer

.ag, the ccTLD for Antigua and Barbuda
Aargau, a Swiss canton
Ág, a village in Hungary
Algeria, FIPS country code
Province of Agrigento, a Province of Italy (ISO 3166-2:IT code AG)
Antigua and Barbuda, a twin-island nation lying between the Caribbean Sea and the Atlantic Ocean
Argeș County, a county in Romania (ISO 3166-2:RO code AG)

Silver, symbol Ag, a chemical element
Agamous, a gene which plays a role in the ABC model of flower development
Allocation group, a sub-volume in a computer file system
Anion gap, a value calculated from the results of several medical tests
Antigen, a substance that stimulates an immune response
Astronomische Gesellschaft, a German astronomical society
Attogram, an SI derived unit of mass
Attribute grammar, in formal language theory
Inequality of arithmetic and geometric means, in mathematics
American Holland-class submarine (Amerikansky Golland), a class of Imperial Russian submarines
Miscellaneous Auxiliary, a hull classification for a type of US Navy support ship