GAC

GAC Group, a Chinese automotive company based in Guangzhou, Guangdong
GAC Ireland, an Irish bus manufacturer established with Bombardier (1980–1986)
Games Administration Committee, a committee that organises fixtures within Gaelic games
Gateway Athletic Conference, a suburban St. Louis high school extracurricular league in Missouri
Geological Association of Canada
Global Action for Children, an organization advocating for vulnerable children in the developing world
Global Affairs Canada, a department of the Canadian federal government
Gloster Aircraft Company, an aircraft manufacturing company based in Gloucester, England
General Advisory Committee, a committee in charge of the first US nuclear bomb.

Ghost Adventures Crew, the team featured on the Ghost Adventures television series
Graphic Adventure Creator, a game creation system of the 1980s by Incentive software
General Amusement Corporation, an entertainment booking agency founded in the early 1930s
Great American Family, a family-oriented general entertainment cable TV channel formerly known as Great American Country
- Great American Faith & Living, its sister network

Global Assembly Cache, a component of Microsoft's .NET Framework
Generic Artificial Consciousness, a database and software of Mindpixel
Granular activated carbon, a highly porous and absorbent material used extensively in water filtration

Globular Amphora culture, an archaeological culture in central Europe
Global Assessment Certificate, a university preparation and foundation studies program
Great American Conference, an NCAA Division II Conference formed in 2010
Guglielmo Achille Cavellini (1914–1990), influential art collector and mail artist
Gender Affirming Care, an extension of the acronym "GAC"
GAC, a codon for the amino acid aspartic acid

Acronyms