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ACT may refer to:

Most commonly:

• Australian Capital Territory, the capital territory of the Commonwealth of Australia
• ACT (examination), a college entrance exam in the United States

In business:

• Advanced Cell Technology, a biotech corporation involved in researching and developing cloning and stem cell technologies
• Ada Core Technologies, now AdaCore, a software company that develops an Ada compiler, tools and libraries
• Applied Computer Techniques, renamed Apricot Computers in 1985, a computer services company
• Aviation Composite Technology, an aircraft manufacturer in the Philippines
• ACT (NASDAQ), Automated Confirmation of Transactions, a trade reporting and clearing system
• Advance corporation tax, a tax collected in the United Kingdom until 1999

Organizations:

• ACT New Zealand, a political party in New Zealand
• Academy of Clinical Thyroidologists
• Association for Competitive Technology, a pro-Microsoft lobby group
• The Association of Commercial Television in Europe, represents the business interests of the commercial television sector at the EU institutions
• Association of Cinematograph Technicians, now the Association of Cinematograph Television and Allied Technicians
• Association of Corporate Treasurers
• Action for Children's Television, an organization dedicated to improvements in children's television
• Alliance of Concerned Teachers, an alliance of teachers, educators and teacher organizations in the Philippines
• America Coming Together, a United States political group
• AIDS Committee of Toronto
• Asian College of Technology (ACT), a private university in Cebu City, Cebu, Philippines.
• Association for Citizenship Teaching, a professional subject association for teachers of citizenship

In government:

• Allied Command Transformation, a NATO strategic command
• Advanced Concepts Team, a research team of the European Space Agency

In science and technology:

• ACT!, contact management software
• ACT-R, a symbolic cognitive architecture
• Apple Certified Trainer
• Astrographic Catalog/Tycho, a star catalogue. See Hipparcos Catalogue
• Atacama Cosmology Telescope, a telescope under construction in Chile

In medicine:

• Artemisinin-based combination therapy, a treatment for malaria
• Assertive community treatment, a system for treating mental illness
• Acceptance and Commitment Therapy, a type of cognitive-behavioral therapy

In entertainment:

• A.C.T, a progressive rock band from Sweden
• ACT Theatre, in Seattle, Washington
• American Conservatory Theater, in San Francisco, California

Other:

• Ascot railway station, a railway station in the United Kingdom with the National Rail code "ACT"
• Waco Regional Airport, an airport in Waco, Texas, United States, with the IATA airport code "ACT"
• Agency for Community Transit, Madison County Transit's paratransit system. Abbreviation is "ACT"

See also

• Act
• ACTS

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