FISI
| Acronym | Definition |
|---|---|
| FISI | Facultad de Ingeniería de Sistemas e Informática (Spanish: Faculty of Engineering and Computer Systems; various locations) |
| FISI | Federazione Italiana Sport Invernali (Italian Federation for Winter Sports) |
| FISI | Fachinformatiker für Systemintegration (German: degree in information technology) |
| FISI | Fulbright International Summer Institute (academic and cultural program) |
| FISI | Fecal Incontinence Severity Index |
| FISI | Financial Institution Services, Inc. (now Progeny Marketing Innovations) |