| Acronym | Definition |
|---|
| FIN | Final |
| FIN | Financial |
| FIN | Finance |
| FIN | Finland |
| FIN | Finish |
| FIN | Financial Information |
| FIN | Finance Department (International Monetary Fund) |
| FIN | Federazione Italiana Nuoto (Italian: Italian Swimming Federation) |
| FIN | Fingerprint Identification Number |
| FIN | Friend in Need |
| FIN | Input Frequency |
| FIN | Facility Identification Number |
| FIN | Fédération des Industries Nautiques (French: Federation of Nautical Industries) |
| FIN | Federal Identification Number |
| FIN | FASB Interpretation Number |
| FIN | Finfishes (FAO fish species code) |
| FIN | Fix It Now |
| FIN | Freedom to Innovate Network (Microsoft) |
| FIN | Fleet Identification Number |
| FIN | Field Information Notice |
| FIN | Factory Inspectorate Note (UK) |
| FIN | Ford Interfaith Network |
| FIN | Functional Identification Number |
| FIN | Fondo Imperatrice Nuda contro la Sperimentazione Animale (Italian: Naked Empress Fund Against Animal Testing; Italy) |
| FIN | Finnair Oyj, Finland (ICAO code) |
| FIN | Fisher Identification Number (Pacific region) |