| Abbreviation | Definition |
|---|---|
| CROA | Celebration Residential Owners Association |
| CRPO | College of Registered Psychotherapists of Ontario |
| CRR | Center for Retirement Research |
| CRSI | Concrete Reinforcing Steel Institute |
| CRTC | Clay Roof Tile Council |
| CRTO | College of Respiratory Therapists of Ontario |
| CSA | Canadian Society of Agronomy |
| CSA | Casting Society of America |
| CSA | Cloud Security Alliance |
| CSA | Costume Society of America |
| CSAC | Chimney Safety Association of Canada |
| CSAI | Chimney Sweeps Association of Ireland |
| CSAM | California Society for Addiction Medicine |
| CSAO | Construction Association of Ontario (1929–2010) |
| CSAO | Construction Safety Association of Ontario |
| CSC | Canadian Society for Chemistry |
| CSC | Canadian Society of Cinematographers |
| CSC | Construction Specifications Canada |
| CSC | Customer Service Centre |
| CSChE | Canadian Society for Chemical Engineering |