| Acronym | Definition |
|---|
| FOST | Finding Of Suitability to Transfer |
| FOST | Forsvarets Sikkerhetstjeneste (Norwegian: Defense Security Service; Norway) |
| FOST | Force Océanique Stratégique (French: Strategic Oceanic Force; French Navy) |
| FOST | Flag Officer Sea Training |
| FOST | Fort Stanwix National Monument (US National Park Service) |
| FOST | Foundation for Sustainable Technology (Nepal) |
| FOST | Fundamentals Of Software Testing |
| FOST | Social and Cultural Food Studies |
| FOST | Friends of the State Theatre (Bay City, Michigan) |
| FOST | Fiber Optics Survivable Techniques |