| Acronym | Definition |
|---|
| FNIS➣Fidelity National Information Services (Jacksonville, FL) |
| FNIS➣Fidelity National Information Solutions (Santa Ana, CA) |
| FNIS➣Foreign National Information System (student registration) |
| FNIS➣Fast Neutron Irradiation System (physics) |
| FNIS➣First Nations Interdisciplinary Studies (Canada) |