ACT

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