ACT

ACT may refer to:

• Australian Capital Territory, the capital territory of the Commonwealth of Australia
• ACT (test), a college placement exam in the United States

In business:

• ACT mouthwash from Chattem
• 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
• ACT!, contact management software

Organizations:

• 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
• Academy of Clinical Thyroidologists
• Addenbrooke's Charitable Trust
• Association for Competitive Technology, a technology lobby group
• The Association of Commercial Television in Europe, a group which 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
• Advanced Concepts Team, A research team of the European Space Agency
• 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, sponsor of Fashion Cares
• Asian College of Technology, a private university in the Philippines
• Association for Citizenship Teaching, a professional subject association for teachers of citizenship
• United Education Institute or Advanced Career Training, a private post-secondary educational facility with locations in Georgia and Florida
• Australian College of Theology
• Amazon Conservation Team, a non-profit organization that works in partnership with indigenous people to protect the Amazon rainforest

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-R, a symbolic cognitive architecture
• ACT (audio format), file format
• Active voice or Actor role in interlinear glossing
• Apple Certified Trainer, one of the Apple certification programs
• Astrographic Catalog/Tycho, a star catalogue; see Hipparcos Catalogue
• Atacama Cosmology Telescope, a telescope 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
• Activated clotting time

In entertainment:

• A.C.T, a progressive rock band from Sweden
• ACT Theatre, in Seattle, Washington
• American Conservatory Theater, in San Francisco, California

In sport:

• Australia national cricket team
• American Canadian Tour, a race organisation.

In transport:

• Ford ACT, a people mover, short for Automatically Controlled Transportation or Activity Center Transit
• 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
• Azienda comunale del traffico, a former transport operator in Lugano, Switzerland