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 (album), a 2012 album by American band RNDM
ACT (album), a 2009 album by Ben Wendel, Harish Raghavan, and Nate Wood
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
Air ACT, a Turkish charter airline
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 (for-profit organization), provides assessments for US school students, etc.
ACT (test), for college admission, US
Asian College of Technology, Cebu City, Philippines
Australian College of Theology
Aksorn Charoen Tat, Thai educational publishing company
Government and 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 Agency