AG

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

Businesses and organizations

Adjutant general, the Army branch responsible for personnel
Administrator-General, 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

.ag, the ccTLD for Antigua and Barbuda
Aargau, a Swiss canton
Ág, a village in Hungary
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, a chemical element with symbol Ag, from the Latin Argentum
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

Anno Graecorum, the Seleucid era, an ancient calendar
Atuagagdliutit/Grønlandsposten, one of the two nationwide newspapers in Greenland
AG, dominical letter of a leap year starting on Sunday
American Girl, a media franchise and doll line by Mattel