| Abbreviation | Definition |
|---|---|
| IFC | Irish Folklore Collec |
| IFC | Irish Folklore Collection |
| IFCO | Irish Film Classification Office |
| IFF | Irish Footie Follower |
| IFFG | Irish Family Farm Group |
| IFFL | Irish Film Festival London |
| IFLF | Irish Film Location Facilities |
| IFSD | Irish Flight Sim Design |
| IFTA | Irish Film Television Academy |
| IGAS | Irish Grain Assurance Scheme |
| IGB | Irish Greyhound Board |
| IGG | Irish Girl Guides |
| IGRM | Irish Gay Rights Movement (Dublin, Ireland) |
| IGRM | Irish Geological Research Meeting (Ireland) |
| IHF | Irish Hotels Federation |
| IHNS | Irish Head and Neck Society |
| IHSL | Irish Homeless Street Leagues |
| IIB | Irish Intercontinental Bank |
| IIHF | Irish Inflatable Hirers Federation |
| IILT | Integrate Ireland Language and Training |