| Acronym | Definition |
|---|
| IFSI➣Institut de Formation en Soins Infirmiers (French: Institute of Nursing Training) |
| IFSI➣Illinois Fire Service Institute (Champaign, IL) |
| IFSI➣Istituto di Fisica dello Spazio Interplanetario (Italy) |
| IFSI➣Intercultural Family Services Inc. (Philadelphia, PA) |
| IFSI➣Illinois Foundation Seeds, Inc. (Tolono, IL) |
| IFSI➣International Financial Services Institute (est. 2003; National College of Ireland) |
| IFSI➣Intelligence Fusion System Integrators |