| Acronym | Definition |
|---|
| IFIS | Intraoperative Floppy Iris Syndrome |
| IFIS | International Food Information Service |
| IFIS | Integrated Flight Information System |
| IFIS | Islamic Finance Information Service |
| IFIS | Integrated Financial Information System (accounting) |
| IFIS | International Flight Inspection Symposium |
| IFIS | Internet Flight Information Service (New Zealand) |
| IFIS | Industry File Information System (environment) |
| IFIS | Institute for Infrastructure Surety (US) |
| IFIS | International Food Information System |
| IFIS | Instrument Flight Instructors School |
| IFIS | International Federation of Information Processing |
| IFIS | Iowa Flood Information System (University of Iowa) |
| IFIS | Integriertes Führungs- & Information System (German CVC2 System) |