| Abbreviation | Definition |
|---|---|
| FRIM | Forest Research Institute of Malaysia |
| FRTI | Feldenkrais Resources Training Institute |
| FRTI | Fire and Rescue Training Institute |
| FSI | Faculty Summer Institute |
| FSI | Financial Services Institute |
| FSI | Financial Stability Institute |
| FSI | Fire Service Institute |
| FSI | Florida Space Institute |
| FSI | Football Science Institute |
| FSI | Foreign Service Institute |
| FSI | Foreign Services Institute |
| FSI | Freeman Spogli Institute |
| FSI | Freshman Scholars Institute |
| FSI | Frontiers of Science Institute |
| FSI | Functional Strength Institute |
| FSI | The Foreign Service Institute |
| FSIA | Food Safety Institute of the Americas |
| FSLI | Food Systems Leadership Institute |
| FSLI | Foundation Study and Language Institute |
| FSRI | Faking Smart Research Institute |