| Abbreviation | Definition |
|---|---|
| COBRA | Cabinet Office Briefing Room A |
| COBRA | Comprehensive Overall Budget Reconciliation Act |
| COC | Comptroller of the Currency |
| COD | Change Of Direction |
| COD | Common Origination and Disbursement |
| COE | Certificate Of Entitlement |
| COFA | Commission Of Fine Arts |
| COFI | Cost Of Funds Index |
| COG | Council Of Governments |
| COI(s) | conflict(s) of interest |
| COICA | Combating Online Infringement and Counterfeits Act |
| COIF | Cost of Incarceration Fee |
| COIN | COunter-INtelligence |
| Col. | Colonel - Marines, - USAF |
| col. | colored |
| COLA | Certificate Of Label Approval |
| COLC | Copyright Office, Library of Congress |
| COLST | Clinician Order for Life Sustaining Treatment |
| COM | COMmunications |
| COMAH | Control of Major Accident Hazards Regulations 1999 |