| 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) |