| Abbreviation | Definition |
|---|---|
| FNMOC | Fleet Numerical Meteorology and Oceanography Center |
| FNR | Ford Nuclear Reactor |
| FNT | Failure Notification Telex |
| FNTC | Fine-needle Transhepatic Cholangiography |
| FO | Foreign Object |
| FO | Forward Observer |
| FO | Functional Objective |
| FOAD | Fetal Origins of Adult Disease |
| FOAM | Foam Optics And Mechanics |
| FOB | Freight on board |
| FOB | Flight Operations Building |
| FOB | Federal Order of Body |
| FOB | Fecal Occult Blood |
| FOB | Free On Board |
| FOBC | Foreign Outward Bills Collected |
| FOBP | Foreign Outward Bills Purchased |
| FOBT | Fecal Occult Blood Test |
| FOBT | Fecal Occult Blood Testing |
| FOC | Flight Of Colors test |
| FOC | Full Operational Capability |
| FOC | Faint Object Camera |
| FOC | Firm Order Commitment |
| FOCL | Friends Of Colorado Lagoon |
| FOCUS | Future Opportunities Careers And Ultimate Success |
| FOD | Facilitator Of The Day |
| FOD | Flight Operations Directorate |
| FOD | Field Operations Division |
| FOE | Friends Of the Earth |
| FOE | Flight Operations |
| FOF | Flight Operations Facilities |
| FOF | First Orbital Flight |
| FOF | First Operational Flight |
| FOF | Firm-On-Firm review |
| FOFI | Future Oriented Financial Information |
| FOH | Frontiers Of Health |
| FOIA | Freedom of Information Act |
| FOIH | Flight Operations Integration Handbook |
| FOLAN | Flight Operations Local Area Network |
| FOLD | Federally-Owned LANDSAT Data |
| FOMC | Federal Open Money Committee |
| FOMR | Flight Operations Management Room |
| FONR | Friends Of Noxubee Refuge |
| FONSI | Finding Of No Significant Impact |
| FOOT | Focusing On Offensive Trash |
| FOP | Flight Operations Panel |
| FOP | Fligth Operations Plan |
| FOP | Fraternal Order of Police |
| FOP | Form Of Payment |
| FOPG | Flight Operations Planning Group |
| FOPS | Falling Objects Protection Standard |