| 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) |