| Abbreviation | Definition |
|---|---|
| FIS | Fitness Instructor Specialist |
| FISA | Food Industry Sanitation Auditor |
| FIST | Fuel Island Service Technician |
| FIT | Fireman In Training |
| FJSE | FireEye Junior Systems Engineer |
| FL | Freelancer |
| FLP | Fuzzy Logic Professional |
| FM | Field Manager |
| FM | Field Marshall |
| FM | File Man |
| FM | Finance Manager |
| FM | Fire Marshall |
| FMA | Facilities Management Administrator |
| FMP | Firearm Manufacturing Professional |
| FNP | Family Nurse Practitioner |
| FO | Financial Officer |
| FO | Forward Observer |
| FOB | Father Of Bride |
| FOB | Fresh Off Boat |
| FOB | Friend Of Bill |