Act

Act or ACT may refer to:

Arts and entertainment

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

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

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, representing marginalised people
ACT Teachers Partylist, a political party in the Philippines, representing teachers
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, (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 in partnership with indigenous people to protect the Amazon rainforest
America Coming Together, a US political group

Academy of Clinical Thyroidologists, United States
Alliance of Concerned Teachers, an alliance of teachers, educators and teacher organizations in the Philippines
American College of Toxicology
Association for Citizenship Teaching, UK, promotes citizenship teaching
Association for Competitive Technology, international association of software developers
Association of Cinematograph Television and Allied Technicians, UK
Association of Corporate Treasurers, UK

Addenbrooke's Charitable Trust, a UK charity
The Association of Commercial Television in Europe, a group which represents the business interests of the commercial television sector at the EU institutions
Anglican Church in Thailand
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

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, UK, National Rail code
Waco Regional Airport, Texas, US, IATA airport code
Australian Capital Territory, the territory in which the Australian capital city of Canberra is seated

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