| CSEC | California Self Esteem Conference 
| Others |
| CSEC | Campus Student Election Commission
| Others |
| CSEC | Caribbean Secondary Education Certificate
| Others |
| CSEC | Catholic Strengths and Engagement Community
| Others |
| CSEC | Chicago Sunday Evening Club
| Others |
| CSEC | Child Support Enforcement Council
| Others |
| CSEC | Civil Society Education Coalition
| Others |
| CSEC | Civil Society Empowerment Centre
| Others |
| CSEC | Clinical Skills Evaluation Collaboration
| Others |
| CSEC | Clinical Study Evaluation Committee
| Others |
| CSEC | Colorado Springs Early Colleges
| Others |
| CSEC | Commercial Sexual Exploitation of Children
| Others |
| CSEC | Commercially Sexually Exploited Children
| Others |
| CSEC | Commission on State Emergency Communications
| Others |
| CSEC | Commissione della Scienza, dell'Educazione e della Cultura
| Others |
| CSEC | Communications Security Establishment Canada
| Others |
| CSEC | Communications Security Establishment CSE
| Others |
| CSEC | Comprehensive Sustainable Energy Committee
| Others |
| CSEC | Computer Science Engineers Community
| Others |
| CSEC | Computerized Self Evaluation Checklist
| Others |
| CSEC | Computerized Self-Evaluation Checklist
| Others |
| CSEC | Connecticut State Employees Campaign
| Others |
| CSEC | Connecticut State Employees' Campaign
| Others |
| CSEC | Construction Science and Engineering Center
| Others |
| CSEC | Corporate Specialist Education Committee
| Others |
| CSEC | Crary Science and Engineering Center
| Others |
| CSEC | Customer Service Excellence Corporation
| Others |
| CSEC | Cyber Security Education Consortium
| Others |
| CSEC | Cyber Security Evaluation Centre
| Others |
| CSEC | Cyber Security Experience Centre
| Others |