GCA

GCA may refer to:

In science and technology:

• GCA (file format), a compressed archive file format
• GCA (gene), a human gene
• Generalized Clifford algebra, in mathematics
• Geochimica et Cosmochimica Acta, a scientific journal specialising in geochemistry, cosmochemistry, and meteoritics
• Giant cell arteritis, a form of vasculitis also known as temporal arteritis
• General combining ability, a measure used in plant breeding
• Graphic Communications Association, print/publish/IT trade association now Idealliance

Other uses:

• Games Convention Asia, a video game and interactive technology convention held annually in Singapore
• Georgia-Cumberland Academy, a Seventh-day Adventist private high school in the U.S. state of Georgia
• Global Cybersecurity Agenda, a framework for international cooperation in cybersecurity launched in 2007 by Hamadoun Touré
• Gothenburg City Airport, western Sweden
• Grand Central Airport (United States), a former airport in Glendale, California
• Government College of Architecture in Lucknow, India
• Garden Centers of America, a nonprofit organization of independently owned garden centers since 1973
• Great Commission Association, an association of evangelical Christian churches
• Ground-controlled approach, a precision ground-radar based aircraft guiding procedure for landing in marginal weather conditions
• Gun Control Act of 1968, a U.S. federal law that regulates the firearms industry and firearms owners.
• Gun Control Australia, a gun-control lobbying group in Australia.