| Acronym | Definition |
|---|
| DCO | Demande Chimique En Oxygène (French) |
| DCO | District Coordination Officer (Pakistan) |
| DCO | Digitally Controlled Oscillator |
| DCO | Defence Community Organisation (Australia) |
| DCO | District Coordination Office (Israeli-Palestinian Oslo Agreement) |
| DCO | defense coordinating officer (DOD) |
| DCO | Derivatives Clearing Organization (US Commodity Futures Trading Commission) |
| DCO | Doping Control Officer (athletic organizations) |
| DCO | Developer's Certificate of Origin (Linux) |
| DCO | District Commodore |
| DCO | Deputy Commanding Officer |
| DCO | Data Center Operations |
| DCO | Digital Central Office |
| DCO | Document Control Officer |
| DCO | Direct Commission Officer |
| DCO | Delayed Compliance Order (EPA) |
| DCO | Dial Central Office |
| DCO | Duke of Connaught's Own (Canadian regiment nickname) |
| DCO | Document Change Order |
| DCO | Dental Care Organization |
| DCO | Damage Control Officer |
| DCO | Domino Collaboration Objects (Lotus Notes/Domino COM interface) |
| DCO | Defense Connect Online (US DoD Defense Information Systems Agency) |
| DCO | Dyschondrosteosis |
| DCO | Drive Configuration Overlay (hard disks) |
| DCO | Data Conversion Operator |
| DCO | Direct Chemical Oxidation |
| DCO | Designated Complaints Officer (UK) |
| DCO | Deputy Commissioner for Operations |
| DCO | Dues Check Off (union working dues deducted from employees checks) |
| DCO | Docket Control Order (sets the trial schedule) |
| DCO | Detailed Checkout (NASA) |
| DCO | Diluted Crude Oil |
| DCO | Distributed Cooperative Object |
| DCO | Disaster Control Officer |
| DCO | Debark Control Officer |
| DCO | Database Configuration Output |
| DCO | Downtime Due to Corrective Actions |
| DCO | Doctrine Coordination Office |
| DCO | Director Controller |
| DCO | Director Combat Operations (USAF) |
| DCO | District, Colonial and Overseas (Barclay's Bank) |
| DCO | Document Change Off-Line |
| DCO | Delivery Control Officer (US DoD) |
| DCO | District Curriculum Office (education) |
| DCO | Delmar Community Orchestra (Delmar, NY) |
| DCO | Direct Capture of Objectives |