| Abbreviation | Definition |
|---|---|
| CSA | Customs Self Assessment |
| CSAC | Computer Science Accreditation Commission |
| CSAD | College Savings Account Demonstration |
| CSAP | Center for Substance Abuse Prevention |
| CSAT | Chemical Security Assessment Tool |
| CSC | Child Study Center |
| CSCO | Compliance Services Collection Operations |
| CSD | Computer Support Division |
| CSDC | Comprehensive Solution of Debt Crisis |
| CSDI | Colombia Strategic Development Initiative |
| CSE | Office of Child Support Enforcement |
| CSEM | Case Studies in Environmental Medicine |
| CSEO | Child Support Enforcement Office |
| CSER | Center for Stabilization and Economic Reconstruction |
| CSET | Certification And Standardization Evaluation Team |
| CSHP | Center for State Health Policy |
| CSI | Center for the Study of Intelligence |
| CSIA | Chemical Safety Improvement Act of 2013 |
| CSIS | Center for Strategic and International Studies |
| CSM | Chemical Surety Material |