The abbreviation ACT or A.C.T. may refer to:

• ACT (cognitive model), created by John R Anderson
• ACT (examination)
• ACT New Zealand (political party and movement)
• Act of Parliament
• Ada Core Technologies
• America Coming Together, an American political group
• Annual Change Traffic
• Applied Computer Techniques, a computer services company founded in 1965. In 1985 it was renamed Apricot Computers.
• Artemisinin-based Combination Therapy, a treatment for malaria
• Association for Citizenship Teaching
• Australian Capital Territory
• Aviation Composite Technology, an aircraft manufacturer in the Philippines

See also

• act