Act

Act or ACT may refer to:

Arts and entertainment

Acting, action of an actor in a theatrical performance
Act (drama), a segment of a performance, such as a play or opera
Musical act, an individual or a group of musicians that are recognized as a unit
Act (band), a British band
A.C.T, a progressive rock band from Sweden
ACT Music, a German, Munich-based music label which was founded in 1992
ACT Theatre, in Seattle, Washington
American Conservatory Theater, in San Francisco, California
Acts, a 2012 album by American band RNDM

AdaCore, formerly Ada Core Technologies, a software company that develops an Ada compiler, tools and libraries
Advanced Cell Technology, a biotech corporation involved in researching and developing cloning and stem cell technologies
Advanced Computer Techniques, a U.S. software and consulting company from 1962–1994
Apricot Computers, known as Applied Computer Techniques until 1985, a computer services company
Association for Competitive Technology, a technology lobby group
Aviation Composite Technology, an aircraft manufacturer in the Philippines

Asian College of Technology, a private college in the Philippines
Australian College of Theology
United Education Institute or Advanced Career Training, a private post-secondary educational facility with locations in Georgia and Florida
ACT (nonprofit organization)
- ACT (test), a standardized test to assess high school students' academic achievement and college readiness administered by the organization

Advanced Concepts Team, a research team of the European Space Agency
Agency for Community Transit, Madison County Transit's paratransit system
Allied Command Transformation, a NATO strategic command
Azienda comunale del traffico, a former transport operator in Lugano, Switzerland

Academy of Clinical Thyroidologists
American College of Toxicology, a professional organization in the field of toxicology
Association for Citizenship Teaching, a professional subject association for teachers of citizenship
Association of Cinematograph Television and Allied Technicians, formerly the Association of Cinematograph Technicians
Association for Contract Textiles
Association of Corporate Treasurers

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 New Zealand, a political party in New Zealand
Action for Children's Television, an organization dedicated to improvements in children's television
Addenbrooke's Charitable Trust
The Association of Commercial Television in Europe, a group which represents the business interests of the commercial television sector at the EU institutions
Alliance for Change and Transparency, a political party in Tanzania
Alliance of Concerned Teachers, an alliance of teachers, educators and teacher organizations in the Philippines
Amazon Conservation Team, a non-profit organization that works in partnership with indigenous people to protect the Amazon rainforest
America Coming Together, a US political group
Anglican Church in Thailand

Act (document), a document recording the legality of a transaction or contract
Acting (law) refers to 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

Ascot railway station, a railway station in the UK with the National Rail code "ACT"
Waco Regional Airport, an airport in Waco, Texas, US, with the IATA airport code "ACT"
Australian Capital Territory, the federal district of the Commonwealth of Australia

ACT-R, a symbolic cognitive architecture
Apple Certified Trainer, one of the Apple certification programs
ACT (NASDAQ), Automated Confirmation of Transactions, a trade reporting and clearing system
Act! CRM, Contact Management and CRM software

Acceptance and commitment therapy, a type of cognitive-behavioral therapy
Acetylcholine, (ACt/ACh) a neurotransmitter
Activated clotting time
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

Act or S-act, the action of a monoid on a set, or a semiautomaton
ACT (audio format), a file format
Ford ACT, a people mover, short for Automatically Controlled Transportation or Activity Center Transit
Active voice or Actor role, in linguistics and pedagogy, in interlinear glossing
Astrographic Catalog/Tycho, a star catalogue; see Hipparcos Catalogue
Atacama Cosmology Telescope, a telescope in Chile

ACT (test), a college placement exam in the US
ACT mouthwash, produced by Chattem
Act or Acts, an obsolete name for the defence of theses at the University of Oxford and University of Cambridge
Acting (rank), in the military when someone assumes a higher rank temporarily
Achterhooks (ISO 639-3 language code ACT)