| Acronym | Definition |
|---|
| CCSS | Caja Costarricense del Seguro Social (Costa Rican Social Security Institution) |
| CCSS | Center for Civil Society Studies |
| CCSS | Childhood Cancer Survivor Study (St. Jude Children's Research Hospital; Memphis, TN) |
| CCSS | Commission des Comptes de la Sécurité Sociale (French: Social Security Accounts Commission) |
| CCSS | Commodity Command Standard System |
| CCSS | Centre Commun de la Sécurité Sociale (French: Joint Center for Social Security; Luxembourg) |
| CCSS | Common Channel Signaling System |
| CCSS | Comprehensive Community Support Services (New Mexico) |
| CCSS | Council of Christian Scholarly Societies |
| CCSS | Cass Community Social Services |
| CCSS | Caisse Commune de Sécurité Sociale (French: Common Fund for Social Security) |
| CCSS | Cryptologic Combat Support System |
| CCSS | Center for Complex Systems Studies (Kalamazoo College) |
| CCSS | Center for Computer System Security |
| CCSS | Computer Crime and Security Survey |
| CCSS | Combat Command Support System |
| CCSS | Comanche Crew Support System |
| CCSS | Community Charge for Standard Spending (UK) |
| CCSS | Controlled Copy Support Systems, Inc |
| CCSS | Combat Communications Support Squadron |
| CCSS | Communications Channel Signalling System |
| CCSS | Consolidated Critical Support System |
| CCSS | Conference of the Cognitive Science Society |
| CCSS | Chaotic Complex Spreading Sequence |
| CCSS | Combat Cryptologic Support System |
| CCSS | Command & Control Switching Systems |
| CCSS | Command Center Support System |
| CCSS | Command Commodity Supply System |
| CCSS | CSIRT Collaboration Support System |
| CCSS | Command and Control Simulation System |
| CCSS | Coordination Committee on Social Sector |
| CCSS | Canadian Computer Security Symposium |
| CCSS | Cadet Command and Staff School (Howard Payne University; Brownwood, TX) |
| CCSS | China Current Student Society (Harvard University) |
| CCSS | Cedar Creek State School (Gold Coast, Australia) |
| CCSS | Cruise Control Set Switch |
| CCSS | Communications-Computer Systems Security |
| CCSS | Coordinating Committee on the Social Sector |
| CCSS | Colorado Cactus and Succulent Society |