| Abbreviation | Definition |
|---|---|
| FIOC | Foundation of Iranians of Connecticut |
| FIPR | Foundation for Information Policy Research |
| FIRD | Foundation for Integrated Rural Development |
| FIRE | Foundation for Individual Rights in Education |
| FIRE | Foundations in Reaching Excellence |
| FIS | Foundation for Infinite Survival |
| FIS | Foundation for International Services |
| FISE | Foundation for Innovation and Social Entrepreneurship |
| FISE | Foundation for International Space Education |
| FISU | Foundation for International Spiritual Unfoldment |
| FIT | Foundation for an Independent Tomorrow |
| FIT | Foundations of Interface Technologies |
| FITA | Foundation for Information Technology Accessibility |
| FIU | Foundation for International Understanding |
| FIYA | Foundation for Interscholastic Youth Athletics |
| FJBG | Fundación Juan Bautista Gutierrez (Spanish; Guatemalan community service foundation) |
| FJD | Foundation for Justice and Development |
| FJR | Foundation for Jacobson Resonance |
| FKAF | Foxley Kingham Anniversary Foundation |
| FKL | Foundations of Knowledge and Learning |