- DCO: Directorate of Drugs Control Odisha
- DCO: Directorate of Census Operations Odisha
- DCO: Digitally Controlled Oscillator
- DCO: Dynamic Creative Optimization
- DCO: District Coordination Officer
- DCO: Direct Capture Objectives
- DCO: Development Consent Order
- DCO: Doping Control Officer
- DCO: Derivatives Clearing Organization
- DCO: Diploma in Computer Operator
- DCO: Docket Control Order
