RFSI
| Acronym | Definition |
|---|---|
| RFSI | Residential Fire Safety Institute (United States Fire Administration) |
| RFSI | Retail Financial Services Ireland (banking) |
| RFSI | Rochester Federal Subcontracting Initiative (New York; est. 2003) |
| RFSI | Rust Federal Services, Inc. |
| RFSI | Rescue from Space Invaders (video game) |
| RFSI | Richmond Fellowship Society India (est. 1986) |