| Abbreviation | Definition |
|---|---|
| BL | Bank Larceny |
| BNDD | Bureau of Narcotics and Dangerous Drugs |
| BNPA | Black Nationalist Photograph Album |
| BOQ | Bachelor Officers' Quarters |
| BOSSI | Bureau Of Special Services and Investigations |
| BRDR | Border of .... |
| BS | Boston Field Office |
| BSSI | Bureau of Special Services and Investigations |
| BSU | Black Student Union |
| BT | Butte Field Office |
| BTK | Bind, Torture, Kill |
| BU | Buffalo Field Office |
| BUDED | Bureau Deadline |
| BUFIL | BUreau FILes |
| CAMS | Certified Anti Money-laundering Specialist |
| CAPM | Crime Analysis Project Manager |
| CAX | Computer-Assisted Exercise |
| CBI | Central Bureau of Investigation |
| CBRNE | Chemical, Biological, Radiological, Nuclear, and Explosive |
| CC | Carbon Copy |