FESS
| Acronym | Definition |
|---|---|
| FESS | Functional Endoscopic Sinus Surgery |
| FESS | Further Education Support Service (est. 1997; Ireland) |
| FESS | Family Economic Self Sufficiency (women's economic project) |
| FESS | Flywheel Energy Storage System |
| FESS | Fire Emblem Sanctuary of Strategy (forum) |
| FESS | Facilities Engineering Supply System |
| FESS | Facilities and Equipment Support Services |