| Abbreviation | Definition |
|---|---|
| FNCI | Friends of the National Collections of Ireland |
| FONI | Freedom Of Northern Ireland |
| FSAI | Food Safety Authority of Ireland |
| FSNI | Forensic Science Northern Ireland |
| FSNI | Forest Service Northern Ireland |
| FSNI | Funeral Services Northern Ireland |
| FUTAN | Family Unable To Anticipate Neuro-event |
| GAIF | Great American Irish Festival |
| GANI | Government Accounting Northern Ireland |
| GEAI | Good Energies Alliance Ireland |
| GGI | Groningen Glasgow Ireland |
| GIIPS | Greece Ireland Italy Portugal and Spain |
| GIIPS | Greece Italy Ireland Portugal and Spain |
| GIPF | Great Irish Potato Famine |
| GIPS | Greece Ireland Portugal and Spain |
| GNRI | Great Northern Railway Ireland |
| GOI | Government Of Ireland |
| GPID | German Portal of Irish Dancing |
| GPNI | Green Party in Northern Ireland |
| GRGI | Global Restructuring Group Ireland |