| Acronym | Definition |
|---|
| IFN | Interferon |
| IFN | Islamic Finance News (publication) |
| IFN | Leibniz Institut Für Neurobiologie (German: Leibniz Institute for Neurobiology; Magdeburg, Germany) |
| IFN | Institut Français pour la Nutrition (French Nutrition Institute) |
| IFN | Istituto di Fotonica e Nanotecnologie (Italian: Institute for Photonics and Nanotechnologies) |
| IFN | Ice-Forming Nuclei |
| IFN | Individual Family Needs (India) |
| IFN | Institut de la Francophonie Numérique (French: Digital Francophonie Institute) |
| IFN | Independent Financial Network (now Umpqua Holdings Corporation) |
| IFN | Internet-Facing Network (computer networking) |
| IFN | Indie Film Nation (podcast) |
| IFN | Item For Negotiation |
| IFN | Islamic Foundation North |
| IFN | Inforeach FIX (Financial Information Exchange) Network (Chicago, IL) |
| IFN | International Federation of Numismatists (est. 1977) |