IFIR
| Acronym | Definition |
|---|---|
| IFIR | International Federation of Iranian Refugees |
| IFIR | International Forest Industry Roundtable (est. 1994) |
| IFIR | Interpolated Finite Impulse Response (digital signal processing filter) |
| IFIR | Institute for Federalism and Intergovernmental Relations (Lexington, Kentucky, USA) |
| IFIR | Initial Field Incident Rate (Dell) |
| IFIR | Innsbruck Forum on International Relations (est. 2003; Austria) |