| Acronym | Definition |
|---|
| CSSA | Crop Science Society of America |
| CSSA | Club Sportif Sedan Ardennes (French sports club) |
| CSSA | Certified Sonicwall Security Administrator |
| CSSA | Comprehensive Social Security Assistance |
| CSSA | Cold Start Spark Advance |
| CSSA | California State Student Association |
| CSSA | Cactus and Succulent Society of America |
| CSSA | Catholic Social Services Australia |
| CSSA | Computer Society of South Africa |
| CSSA | Chinese Student and Scholar Association (MIT) |
| CSSA | Canadian Shooting Sports Association |
| CSSA | Certified System Security Analyst (India) |
| CSSA | Colorado State Shooting Association |
| CSSA | Canadian Sanitation Supply Association |
| CSSA | Community Social Services Act (Minnesota) |
| CSSA | Communications Supply Service Association |
| CSSA | Computer Software and Services Association |
| CSSA | Computer Science Students Association (University of Ottawa, Canada) |
| CSSA | Civil Service Sailing Association (UK) |
| CSSA | Center for Space Science and Astrophysics (Stanford University) |
| CSSA | Corporation des Sciences de la Sante de l'Atlantique (Atlantic Health Sciences Corporation; Saint John, NB, Canada) |
| CSSA | Cooperative Station Service Accountability (US NOAA) |
| CSSA | Combat Service Support Area |
| CSSA | Connecticut State Society of Anesthesiologists |
| CSSA | Concrete Society of Southern Africa |
| CSSA | Coarse Sun Sensor Assembly |
| CSSA | Centralized Software Support Activity |
| CSSA | Contaminated Soil Storage Area |
| CSSA | Chartered Secretaries Southern Africa (Johannesburg, South Africa) |
| CSSA | Central Supply Support Activity |
| CSSA | Computing Services and Software Association, Ltd (London, England) |
| CSSA | Computer Science and Systems Analysis Department (Miami University, Oxford, Ohio) |
| CSSA | Consolidated Software Support Activity |
| CSSA | Contact Special Security Administrator |
| CSSA | Committee on Services to State Associations |
| CSSA | Seaman Apprentice, Commissaryman Striker (Naval Rating) |
| CSSA | Consolidated Supply Support Activity |
| CSSA | Council of School Supervisors and Administrators |
| CSSA | Cryptologic Shore/Software Support Activity |
| CSSA | Consolidated SIGINT (Signals Intelligence) Support Activity (US NSA) |
| CSSA | Construction and Sustainable Services for Afghanistan |