| Acronym | Definition |
|---|
| FISO➣Fonds d'Investissement Social (French: Social Investment Fund) |
| FISO➣Fundación Iberamericana de Seguridad y Salud Ocupacional (Spanish: Ibero-American Foundation of Occupational Safety and Health) |
| FISO➣Fast In Slow Out |
| FISO➣Formation en Implantologie du Sud-Ouest (French: Training in Implantology South West) |
| FISO➣Flight Information Service Officer (UK) |
| FISO➣Fantasy & Interactive Sports Online (forum) |
| FISO➣Functionally Integrated Supporting Organization (tax) |
| FISO➣Fault Isolation |
| FISO➣Force Integration Staff Officer |
| FISO➣Facility Information Security Officer (hospitals) |
| FISO➣Fiscal Intermediary Services Organization |
| FISO➣Field Information Systems Organization |
| FISO➣Fit In Stand Out Leadership |
| FISO➣First In, Second Out (accounting) |
| FISO➣Find, Identify, Select, Obtain (library cataloging) |
| FISO➣Functie Informatiesysteem Overheid (Dutch: Function Information System Civil Service) |