| Free Space Optics | Academic & Science |
| Floating Storage and Offloading | Academic & Science |
| Federal Statistical Office | Academic & Science |
| Family Student Organization | Academic & Science |
| Foreign Service Officer | Business |
| Fuel Service Option (car rental) | Business |
| Fund for Special Operations | Business |
| Financial Services Office | Business |
| Financial Service Organization | Business |
| Fox Sports Ohio | Community |
| Flag Service Organization | Community |
| FlightSimulation.org | Community |
| Flagstaff Symphony Orchestra | Community |
| Family and School Organization | Community |
| Forex School Online | Community |
| Fashion Steps Out | Community |
| Flint Symphony Orchestra | Community |
| File System Object | Computing |
| Field Selector Outside | Computing |
| Field Service Organization | Computing |
| Full-scale Output | Electronics |
| Facilities Service Order | General |
| The Flight Safety Organization | General |
| The File Systems Object | General |
| Flax Seed Oil | General |
| Facilities Service Office | General |
| Fuel Shut Off (NOTICE ON METAL PLATES, MACHINERY-EQUIPMENT) | General |
| Family Support Organization | General |
| Fabryka Samochodów Osobowych | General |
| Feed Schemes Observatory | General |
| from surveys of | General |
| Fulltext Sources Online | General |
| Floating Storage Offloading | General |
| Free Space Optical | General |
| Files system object | General |
| Fixed Standardized Output | General |
| Future State Outsourcing | General |
| Fellowships and Scholarships Office | General |
| Friday Squadron Operations | General |
| File Secure Object | General |
| For Services Of | General |
| Full Sail Online | General |
| Fountain Square Outfitters | General |
| Family Support Organizations | General |
| Full Spectrum Oil | General |
| Feature Space Optimization | General |
| Fabryka Samochodow Osobowych | General |
| Four Strokes Only | General |
| Full Synthetic Oil | General |
| Fuel Supply Office | General |
| Fuel Service Option | General |
| Fabryka Samochod? Osobowych | General |
| Footprint Shape Optimization | Governmental |
| Frito Services Officer | Jobs |
| Facility Security Officer | Jobs |
| Floor Support Officer | Jobs |
| Fractional Seat Ownership | Messaging |
| Flight Safety Officer | Military and Defence |
| Functional Support Office | Military and Defence |
| Flotilla Staff Officer | Military and Defence |
| Forward Support and Observer | Military and Defence |
| Fire Support Officer | Military and Defence |
| Functional Supplementary Objective | Space Science |
| Freestyle Skiing Ontario | Sports |
