| Abbreviation | Definition |
|---|---|
| CMAB | Constitutional and Mainland Affairs Bureau |
| CMAEC | Capital Market Association of the Eastern Caribbean |
| CNGB | Chief National Guard Bureau |
| CNGB | Chief of the National Guard Bureau |
| CNMB | Central Nuclear Measurements Bureau |
| CNNB | Chicago Neighborhood News Bureau |
| COMB | Canadian Outdoor Measurement Bureau |
| CPB | Community Policing Bureau |
| CPMB | Concrete Plant Manufacturers Bureau |
| CPWB | Child Protection and Welfare Bureau |
| CPWB | Child Protection Welfare Bureau |
| CRB | credit reference bureau |
| CSB | Collection Service Bureau |
| CSSB | Cedar Shake And Shingle Bureau |
| CSSB | Continental Secret Service Bureau |
| CVB | Convention and Vistors Bureau |
| CVB | Convention Visitor Bureau |
| CVB | Convention Visitors Bureau |
| CWB | Canadian Welding Bureau |
| CWPB | Child Welfare Protection Bureau |