| Acronym | Definition |
|---|
| FIDO | Facts, Issues, Decision, Opinion (legal analysis mnemonic) |
| FIDO | Fast Identity Online (security alliance) |
| FIDO | Flight Dynamics Officer |
| FIDO | Fine Dog |
| FIDO | Fog, Intensive Dispersal Of (aviation pipe network) |
| FIDO | Field Integrated Design and Operations (NASA) |
| FIDO | Free Inmate Dog Obedience (Hamilton, Ohio) |
| FIDO | Fog Investigation & Dispersal Operation |
| FIDO | Filter Device Object |
| FIDO | Functional Device Object (Microsoft Windows drivers) |
| FIDO | Forget It, Drive On (polite form) |
| FIDO | Flight Inspection District Office |
| FIDO | Freaks, Irregulars, Defects, Oddities (coin collecting) |
| FIDO | Face Information Digested On-Line (Mining) |
| FIDO | Film in Digital Out (Kodak's first digital film format) |