| CSSF | California State Science 
| Others |
| CSSF | California State Science Fair
| Others |
| CSSF | Canadian Scientific Submersible Facility
| Others |
| CSSF | Center for the Study of Science Fiction
| Others |
| CSSF | Civil Service Superannuation Fund
| Others |
| CSSF | Coastal States Stewardship Foundation
| Others |
| CSSF | Commission de Surveillance du Secteur Financier
| Others |
| CSSF | Commission de Surveillance du Secteur Financier (Luxembourg)
| Others |
| CSSF | Committee for the Study of the Scottish Flora
| Others |
| CSSF | Common Sense Security Framework
| Others |
| CSSF | Comprehensive School Safety Framework
| Others |
| CSSF | Conflict Security and Stability Framework
| Others |
| CSSF | Conflict Stability and Security Fund
| Others |
| CSSF | Conflict, Stability and Security Fund
| Others |
| CSSF | Congregation of Sisters Saint Felice
| Others |
| CSSF | Container Ship Safety Forum
| Others |
| CSSF | County School Service Fund
| Others |
| CSSF | Croatian Summer Salsa Festival
| Others |
| CSSF | Cyprus Shooting Sport Federation
| Others |
| CSSF | Felician Sisters
| Others |