| Acronym | Meaning |
 | CFR | Code Of Federal Regulations |
| CFSAN | National Center For Food Safety And Applied Nutrition |
| CFTC | Commodity Futures Trading Commission |
| CHAMPVA | Civilian Health And Medical Program Of The Department Of Veterans Affairs |
| CHID | Combined Health Information Database |
| CIA | Central Intelligence Agency |
| CIAO | Critical Infrastructure Assurance Office |
| CIC | Consumer Information Center |
| CID | U.S. Army Criminal Investigation Command |
| CIPRIS | Coordinated Interagency Partnership Regulating International Students (Changed To SEVIS) |
| CIS | Cancer Information Service |
| CIT | Center For Information Technology |
| CITES | Convention On International Trade In Endangered Species Of Wild Fauna And Flora |
| CMHS | Center For Mental Health Services |
| CMS | Centers For Medicare And Medicaid Services |
| CMV | Center For Minority Veterans |
| CNO | Chief Of Naval Operations |
| CNPP | Center For Nutrition Policy And Promotion |
| CNS | Corporation For National Service |
| CONRAIL | Consolidated Rail Corporation |
| CONSER | Cooperative Online Serials |
| COP | Coastal Ocean Program |
| COPS | Office Of Community Oriented Policing Services |
| CPI | Consumer Price Index |
| CPMS | Defense Civilian Personnel Management Service |
| CPO | Corrections Program Office (Merged With BJA) |
| CPSC | Consumer Product Safety Commission |
| CRC | Civil Rights Center |
| CRISP | Computer Retrieval Of Information On Scientific Projects |
| CRP | Conservation Reserve Program |
| CRS | Congressional Research Service; Community Relations Service |
| CSAP | Center For Substance Abuse Prevention |
| CSAT | Center For Substance Abuse Treatment |
| CSB | Chemical Safety And Hazard Investigation Board |
| CSE | Office Of Child Support Enforcement |
| CSI | Center For The Study Of Intelligence |
| CSR | Center For Scientific Review |
| CSREES | Cooperative State Research |
| CTEP | Cancer Therapy Evaluation Program |
| CUAP | College And University Affiliations Program |
| CWC | Chemical Weapons Convention |
| DA | Department Of The Army |
| DARPA | Defense Advanced Research Projects Agency |
| DAU | Defense Acquisition University |
| DCAA | Defense Contract Audit Agency |
| DCRT | Division Of Computer Research And Technology (replaced By CIT) |
| DDC | Defense Distribution Center |
| DEA | Drug Enforcement Administration |
| DECA | Defense Commissary Agency |
| DESA | Department Of Economic And Social Affairs |
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