| Acronym | Definition |
|---|
| DEO | Deodorant |
| DEO | Diversification de l'Économie de l'Ouest Canada (Western Economic Diversification Canada) |
| DEO | Departamento de Estudos Organizacionais (Portuguese: Department of Organizational Studies; Brazil) |
| DEO | Dearborn, Michigan (Airport Code) |
| DEO | District Education Office |
| DEO | Dominion East Ohio (energy) |
| DEO | Defence Estate Officer (India) |
| DEO | Data Entry Operator |
| DEO | Diesel Engine Oil |
| DEO | Division of Enterprise Operations (Wisconsin) |
| DEO | Direct Entry Officer |
| DEO | Deputy Executive Officer |
| DEO | Deduction from Earnings Order (UK) |
| DEO | Detention Enforcement Officer (Department of Homeland Security) |
| DEO | Deputy Ethics Official (various government agencies) |
| DEO | Department of Extranormal Operations (DC Comics Universe) |
| DEO | Drilling Efficiency Optimization (oil industry) |
| DEO | Dynamic External Objects |
| DEO | Desired Educational Outcome |
| DEO | Department of Economic Opportunity |
| DEO | Deputy Education Officer |
| DEO | Digital End Office |
| DEO | Deutsche Evangelische Oberschule in Kairo (German Evangelist high school; Cairo, Egypt) |
| DEO | Director of Emergency Operations |
| DEO | Delta Elite Operatives (online gaming) |
| DEO | Defense Employment Option |
| DEO | Deep East Oakland |
| DEO | Desired Exhaust Oxygen |
| DEO | District Engineer Office |
| DEO | Diocese of El Obeid |
| DEO | Doing Everything Official (band) |