CSA
- Autonomous Trade Unions Centre
- CSA Group
- CSA Mine
- CSA keyboard
- California Society of Anesthesiologists
- Cambridge Scientific Abstracts
- Campaign for a Scottish Assembly
- Camphorsulfonic acid
- Canadian Screen Awards
- Canadian Securities Administrators
- Canadian Snowbird Association
- Canadian Soccer Association
- Canadian Space Agency
- Cano Sport Academy
- CarSharing Association
- Carry-save adder
- Carry-skip adder
- Cartan subalgebra
- Casting Society
- Cationic steroid antibiotics
- Celiac Sprue Association
- Central Statistical Agency
- Central Student Association
- Central simple algebra
- Central sleep apnea
- Centro Sportivo Alagoano
- CernySmith Assessment
- Certified Senders Alliance
- Chemical Abstracts Service
- Chemical safety assessment
- Chief Scientific Adviser (disambiguation)
- Chief of Staff of the United States Army
- Child Support Agency
- Child Support Agency (Australia)
- Child sexual abuse
- Chinese Islamic Association
- Ciclosporin
- Civil Service Alliance
- Civil Service Association
- Civil Services Academy Lahore
- Client SMTP Authorization
- Clinical Skills Assessment
- Cloud Security Alliance
- Cockayne syndrome A
- Cognitive styles analysis
- Colegio San Agustin (disambiguation)
- College Student Alliance
- Combined statistical area
- Commission on Superhuman Activities
- Commission sharing agreement
- Common Scrambling Algorithm
- Common Support Aircraft
- Community-supported agriculture
- Compatriots of South Africa
- Competition Stableford Adjustment
- Complex segregation analysis
- Confederate States Army
- Confederate States of America
- Connectivity Standards Alliance
- Conseil supérieur de l'audiovisuel
- Controlled Substances Act
- Corporate sociopolitical activism
- Credit Support Annex
- Crescent School of Architecture
- Cricket South Africa
- Crime Syndicate of America
- Cyber Security Agency
- Czech Airlines
- Czech Society of Actuaries
- Czech Sport Aircraft
- Federal Motor Carrier Safety Administration
- Intel Communication Streaming Architecture
- List of architecture schools
- Mediterranean climate
- Northern Ireland Child Support Agency
- Subwoofer
- The Covenant, the Sword, and the Arm of the Lord