- DCEO stands for Deputy Chief Executive Officer (various organizations)
- DCEO stands for Department of Commerce and Economic Opportunity (Illinois)
- DCEO stands for Defensive Cyber Effects Operations
- DCEO stands for Division Coloniale d’Extrème-Orient (French infantry division)
- DCEO stands for District of Columbia Energy Office (Washington, DC)
- DCEO stands for Directorate on Corruption and Economic Offences (Lesotho)
- DCEO stands for Defense Communications Engineering Office
- DCEO stands for Division Communications-Electronics Officer
DCEO