| Abbreviation | Definition |
|---|---|
| FG | Free Group |
| FGC | Flue Gas Conditioning |
| FH4 | Tetrahydrofolic acid |
| FHMA | Fullerene Hexa Malonic Acid |
| FIGD | Flow Injection / Gas Diffusion |
| FIGE | Field Inversion Gel Electrophoresis |
| FIM | Finite-volume Icosahedral Model |
| FIM | Flow-following Icosahedral Model |
| FIMA | Flow Injection Mercury Analysis |
| FIONA | Fragrance Institute of North America |
| FIONA | Fragrance Institute of North America |
| FIPS | Fast Imaging Plasma Spectrometer |
| FIR | Far Infra-Red |
| FIT | Fecal Immunochemical Test |
| FIT | Fluid Impingement Technology |
| FITC | Fluorescein IsoThioCyanate |
| Fl | flerovium |
| FL | Free Lime |
| FLA | Flooded Lead Acid |
| FLACC | Families Linked Against Chemical Contamination |