| Acronym | Definition |
|---|
| RFI | Radio Frequency Interference |
| RFI | Request For Information |
| RFI | Request for Information (various organizations) |
| RFI | Radio France Internationale |
| RFI | Radio-France Internationale |
| RFI | Remote File Inclusion (remote internet attack technique) |
| RFI | Rete Ferroviaria Italiana (Italian train network) |
| RFI | Radio Frequency Identification (usually seen as RFID) |
| RFI | RCRA Facility Investigation |
| RFI | Remote Failure Indicator |
| RFI | Repeater Frequency Index |
| RFI | Request for Intelligence (US DoD) |
| RFI | Rapid Fielding Initiative |
| RFI | Radiative Forcing Index |
| RFI | Ready For Installation |
| RFI | Radio Frequency Interface |
| RFI | Ready For Issue |
| RFI | Resonant Field Imaging (energy) |
| RFI | Resin Film Infusion |
| RFI | Request for Inspection |
| RFI | Return from Interrupt (computer memory reference instruction) |
| RFI | Radar Frequency Interferometer (AN/APR-48A radar) |
| RFI | Requirement for Improvement (health care) |
| RFI | Ready for Inspection |
| RFI | Radio Frequency Investigation |
| RFI | Radio Frequency Immunity |
| RFI | Red Flag Investigation (Indiana) |
| RFI | Radio Frequency Interferometer |
| RFI | Representative of a Foreign Interest |
| RFI | Registro Fiat Italiano (Italian: Italian Fiat Registry; automobile club) |
| RFI | Remote Fault Indication |
| RFI | Ruder Finn Interactive (various locations) |
| RFI | Resource File Index |
| RFI | Referencing Fault Insertion (computer programming) |
| RFI | Remedial Field Investigation |
| RFI | Rehabilitation Foundation, Inc. |
| RFI | Requirement to Furnish Information (letter sent to alleged violators of US Treasury Department laws and codes) |
| RFI | Richmond Fellowship International (UK) |
| RFI | Requires Further Information |
| RFI | Road Features Inventory |
| RFI | Remote File Inquiry |
| RFI | Receiver Fixture Interface Alliance |
| RFI | Ready for Invite (gaming) |
| RFI | Request for Installation |
| RFI | Rapid Fault Isolation (MCI) |