CSA

• Canadian Screen Awards, annual awards given by the Academy of Canadian Cinema & Television
• Commission on Superhuman Activities, a fictional American government agency in Marvel Comics
• Crime Syndicate of America, DC Comics supervillains
• C.S.A.: The Confederate States of America, 2004 alternative history mockumentary

• Combined statistical area, defined by the U.S. Office of Management and Budget
• Commission sharing agreement, in financial services
• Controlled Substances Act, in U.S. drug policy
• Credit Support Annex, a legal document regulating collateral for derivative transactions

For-profit businesses

• CSA (database company) (formerly Cambridge Scientific Abstracts)
• Connectivity Standards Alliance (formerly Zigbee Alliance)
• Czech Airlines (ICAO designator CSA; abbreviated ČSA)
• Czech Sport Aircraft, an aircraft manufacturer

Government and military

• Canadian Securities Administrators, an organization of provincial and territorial securities regulators
• Canadian Space Agency, the national space agency of Canada
• Central Statistical Agency of Ethiopia
• Chief of Staff of the United States Army
• Civil Services Academy Lahore, Pakistan
• Compliance, Safety, and Accountability, an American commercial vehicle driver safety program; see Federal Motor Carrier Safety Administration
• Confederate States of America, a break-away republic in North America that lasted from 1861 to 1865
  • Confederate States Army
• Conseil supérieur de l'audiovisuel, a French broadcast content monitoring agency
• CSA Group (formerly the Canadian Standards Association, or CSA), a standards organization based in Canada
• Cyber Security Agency (Singapore)

Professional and trade organizations and unions

• Autonomous Trade Unions Centre (Central des Syndicats Autonomes du Bénin), a trade union centre in Benin
• California Society of Anesthesiologists
• CarSharing Association, a federation of carsharing organizations
• Casting Society of America, acronym commonly seen in the beginning and ending credits of media programs
• Central Student Association, University of Guelph, Ontario, Canada
• Civil Service Alliance, former British trade union federation
• Civil Service Association, Trinidad and Tobago
• Chemical Abstracts Service, a division of the American Chemical Society
• Cloud Security Alliance, which promotes IT security best practices
• College Student Alliance, a federation of student unions, based in Ontario, Canada
• Council of School Supervisors & Administrators, a New York City-based trade union
• Czech Society of Actuaries

Sport

• Canadian Soccer Association, the governing body of soccer in Canada
• Cano Sport Academy, a football club in Equatorial Guinea
• Centro Sportivo Alagoano, a football club, Maceió, Alagoas, Brazil
• Cricket South Africa
• Colored Speedway Association (1924–1936), former open-wheel racing series with African-American drivers

Other organizations

• Campaign for a Scottish Assembly, an association of Scottish political parties and civic groups established in 1989
• Canadian Snowbird Association, for travelling Canadians
• Celiac Sprue Association, a disease support group in the United States
• Certified Senders Alliance, a German whitelist for bulk email senders
• Child Support Agency (UK)
• Child Support Agency Australia
• City School of Architecture, an architecture school in Colombo, Sri Lanka
• Colegio San Agustin (disambiguation), several Catholic schools
• The Covenant, The Sword, and the Arm of the Lord, a 1970s-1980s white supremacist group in Arkansas, United States

Mathematics and computing

• Cartan subalgebra
• Central simple algebra
• Client SMTP Authorization
• Common Scrambling Algorithm
• Intel Communication Streaming Architecture
• Curved Surface Area
• Cross sectional area

Medicine and psychology

• Cationic steroid antibiotics, a family of compounds used to treat diseases
• Central sleep apnea, a sleep disorder
• CernySmith Assessment, a psychological stress questionnaire
• Clinical Skills Assessment exam
• Cockayne syndrome A or ERCC8, a gene whose mutation causes Cockayne syndrome
• Cognitive styles analysis, a computerized measure of cognitive styles
• Cyclosporin A, an immunosuppressant drug

Other uses in science, mathematics, and technology

• Camphorsulfonic acid
• Cardioid subwoofer array
• Common Support Aircraft
• Köppen classification of hot-summer Mediterranean climate, abbreviated Csa
• Chemical Safety Assessment
• Carry-save adder or Carry-skip adder, two different types of adders
• Chief Scientific Adviser (disambiguation)
• CSA keyboard layout, keyboard layout used in Canada
• Complex segregation analysis, a technique within genetic epidemiology

• Chelsea railway station, Melbourne
• Chief Scout's Award (disambiguation)
• Child sexual abuse
• Community-supported agriculture, an alternative socioeconomic model of agriculture and food distribution
• Competition Stableford Adjustment, a golf scoring adjustment for handicapping purposes
• Corporate sociopolitical activism, a firm's public demonstration of support or opposition to a partisan sociopolitical issue
• Customer Service Advisor, a job title