| Acronym | Definition |
|---|
| FDO | Front Desk Officer (various companies) |
| FDO | Flight Deck Officer |
| FDO | Feedback Directed Optimization |
| FDO | Feature Data Object |
| FDO | Foundation Directory Online (Foundation Center) |
| FDO | Fire Direction Officer |
| FDO | Freshman Dean's Office (Harvard University) |
| FDO | Functional Device Object |
| FDO | Flight Dynamics Officer |
| FDO | France Danse Organisation (France) |
| FDO | Fitness Dependent Optimizer (algorithm) |
| FDO | Flexible Deterrent Options |
| FDO | Foreningen Danske Olieberedskabslagre |
| FDO | Forecast Duty Officer (US Navy) |
| FDO | Future Dark Overlord (Scott Sigler) |
| FDO | Flight Duty Officer |
| FDO | Front Door Organics (Canada) |
| FDO | For Declaration Only |
| FDO | Fee Determining/ation Official |
| FDO | Foreign Disclosure Office/Officer |
| FDO | For Deposit Only |
| FDO | Force Deterrent Option |
| FDO | Focused Development Opportunities |
| FDO | Fault Distribution Officer |
| FDO | Femoral Derotational Osteotomy |
| FDO | Failed During Operation |
| FDO | Factory Direct Ordering (Advance Auto Parts) |