# Act

Act, ACT, or The Act may refer to:

## Arts and entertainment

* The Act, American rapper also known as UnoTheActivist
* A.C.T, a Swedish band
* Act (band), a British band
* The Act (band), a Norwegian rock band from the 1980s
* Act (drama), a segment of a dramatic or musical work (such as a play, opera, or ballet)
* Acting, theatrical performance
* ACT Music, a German music label
* The Act (musical), a 1977 musical
* The Act (1989 film), a 1989 British television film by Richard Langridge
* Acts, a 2012 album by American band RNDM
* ACT Theatre, in Seattle, Washington, US
* The Act (TV series), a 2019 true crime TV series
* The Act (video game), a 2007 arcade game produced by Cecropia
* American Conservatory Theater, in San Francisco, California, US
* Arts & Culture Trust, a South African cultural organisation responsible for the ACT Awards

## Aviation

* Aviation Composite Technology, an aircraft manufacturer in the Philippines
* IATA airport code for Waco Regional Airport in State of Texas, USA

## Business organizations

* AdaCore, formerly Ada Core Technologies, Ada specialist software company
* Advanced Cell Technology, stem cell company
* Advanced Computer Techniques, a U.S. software company 1962–1994
* Applied Computer Techniques, later Apricot Computers, UK
* Atria Convergence Technologies, a telecommunications company in India

## Education

* ACT (nonprofit organization), provides assessments etc. for US school students etc.
** ACT (test), for college admission, US
* Asian College of Technology, Cebu City, Philippines
* Australian College of Theology

## Government / military

* AC Transit, a transit agency serving Alameda and Contra Costa Counties, California
* Advanced Clean Trucks Regulation, a rule made by the California Air Resources Board which requires trucks to decarbonize
* Advanced Concepts Team, a research team of the European Space Agency
* Agency for Community Transit, a paratransit system for Madison County Transit, Illinois
* Allied Command Transformation, a NATO strategic command
* Azienda comunale del traffico, a former transport operator in Lugano, Switzerland
* Puerto Rico Highways and Transportation Authority (Spanish: Autoridad de Carreteras y Transportación)

## Law

* Act (document), a document recording the legality of a transaction or contract
* Acting (law), someone temporarily exercising the powers of a vacant position
* Act of parliament, Act of Congress, or Act of Tynwald, a statute or law passed by a legislature
* Advance corporation tax, a tax collected in the UK until 1999

## Political parties and campaigning/advocacy groups

* ACT Alberta, a Canadian coalition to raise awareness about human trafficking
* ACT Alliance, an alliance of churches for coordinating humanitarian assistance and development work
* ACT-CIS Partylist, a political party in the Philippines
* ACT for America, an advocacy group in the United States
* Action for Children's Television, an organization dedicated to improvements in children's television
* Act! (Italy), an Italian political party
* ACT New Zealand, a political party in New Zealand
* ACT Teachers Partylist, a political party in the Philippines
* Agir (France) (French for "Act"), a political party in France
* Alliance for Change and Transparency, a political party in Tanzania
* Amazon Conservation Team, a non-profit organization that works to protect the Amazon rainforest
* America Coming Together, a US political group

## Professional organizations

* Academy of Clinical Thyroidologists, United States
* Alliance of Concerned Teachers, Philippines
* American College of Toxicology
* Association for Citizenship Teaching, UK
* Association of Cinematograph, Television and Allied Technicians, UK
* Association of Corporate Treasurers, UK

## Other organizations

* ACT, former name of Together for Short Lives, a children's charity in the United Kingdom
* Addenbrooke's Charitable Trust, a UK charity
* Anglican Church in Thailand
* The Association of Commercial Television in Europe, a group representing the business interests of commercial television in the EU
* Australian Civic Trust, an Australian urban design organization

## Science, technology, and mathematics
### Computing

* Act! LLC, a customer relationship management software
* ACT (NASDAQ), Automated Confirmation of Transactions, a trade reporting and clearing system
* ACT-R, a symbolic cognitive architecture
* Apple Certified Trainer, one of the Apple certification programs

### Medicine

* Acceptance and commitment therapy, a type of cognitive-behavioral therapy
* Acetylcholine, (ACt/ACh) a neurotransmitter
* Activated clotting time, a test of coagulation
* Adoptive cell transfer, transfer of cells into a patient, usually immune system cells
* Artemisinin based combination therapy, a treatment for malaria
* Assertive community treatment, a system for treating mental illness

### Other uses in science, technology, and mathematics

* ACT, a codon for the amino acid Threonine
* ACT (audio format), a file format
* Act or S-act, the action of a monoid on a set, or a semiautomaton
* Astrographic Catalog/Tycho or Tycho-2 Catalogue
* Atacama Cosmology Telescope, Chile
* Ford ACT, a transit system

## Sports

* American Canadian Tour, a stock car racing series
* Australia national cricket team

## Transport

* ACT, the National Rail code for Ascot railway station, Berkshire, UK

## Other uses

* Acting rank, temporary military rank
* ACT, in linguistics, glossing abbreviation for active voice
* ACT mouthwash, produced by Chattem
* ACT, the ISO 639-3 language code for Achterhooks, a Dutch dialect
* Australian Capital Territory ("The ACT"), the territory in which the Australian capital city of Canberra is seated
* Courtney Act, Australian drag queen, singer, and television personality