Act

Act or ACT may refer to:

Arts and entertainment

• A.C.T, a Swedish band
• Act (band), a British band
• Act (drama), a segment of a dramatic or musical work (such as a play, opera, or ballet)
• ACT Music, a German music label
• ACT Theatre, in Seattle, Washington, US
• Acting, theatrical performance
• Acts, a 2012 album by American band RNDM
• American Conservatory Theater, in San Francisco, California, US
• Arts & Culture Trust, a South African cultural organisation responsible for the ACT Awards

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
• Aviation Composite Technology, an aircraft manufacturer in the Philippines

Bildung

• 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

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 New Zealand, a political party in New Zealand
• ACT-CIS Partylist, a political party in the Philippines
• ACT Teachers 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
• 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 for Competitive Technology, international association of software developers
• Association of Cinematograph, Television and Allied Technicians, UK
• Association of Corporate Treasurers, UK

Sports

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

Other organizations

• ACT (now 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 which represents the business interests of the commercial television sector at the EU institutions
• Associated Container Transport (ACT) a consortium of five British shipping companies - Ben Line, Blue Star Line, Cunard (Port Line), Ellerman Lines and the Harrison Line

Law

• 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

Places

• Australian Capital Territory, the territory in which the Australian capital city of Canberra is seated

Transport

• ACT, the IATA code for Waco Regional Airport, Texas, US
• ACT, the National Rail code for Ascot railway station, Berkshire, UK

Science, technology, and mathematics

Computing

• 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

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

Other uses

• ACT mouthwash, produced by Chattem
• Behavior
• Acting (rank), temporary military rank
• Achterhooks, ISO 639-3 language code, a Dutch dialect
• Courtney Act, Australian drag queen, singer, and television personality