| Acronym | Definition |
|---|
| SFI | Sustainable Forestry Initiative (forest certification program of AF&PA) |
| SFI | Science Foundation Ireland |
| SFI | Santa Fe Institute (scientific research in Santa Fe, New Mexico) |
| SFI | Safi (postal locality, Malta) |
| SFI | Six Figure Income |
| SFI | Strong Future International (Lincoln, NE) |
| SFI | Sequential Fuel Injection |
| SFI | Sword Forum International |
| SFI | Students Federation of India |
| SFI | State Farm Insurance |
| SFI | StarFleet International |
| SFI | Société Française d'Immunologie |
| SFI | Solid Fat Index |
| SFI | SERDES Framer Interface |
| SFI | Solar Flux Index (value based on sunspots to measure radio propagation) |
| SFI | Synthetic Flight Instructor |
| SFI | Software-Based Fault Isolation |
| SFI | Sustainable Futures Institute (Michigan Technological University) |
| SFI | Starfleet Intelligence (fictional, Star Trek) |
| SFI | Sea Fisheries Institute |
| SFI | Sulfur Financial Instrument |
| SFI | Selective Finance for Investment in England (UK government business grant) |
| SFI | Strategy First, Inc. (Montreal based computer software developer/publisher) |
| SFI | Settlement-Free Interconnect (Internet peering) |
| SFI | Sputtered Films, Inc. (computer company) |
| SFI | Scope for Improvement (auditing) |
| SFI | Students for Israel (formerly Northwestern Israel Public Affairs Committee) |
| SFI | Stainless Fabrication, Inc (Springfield, Missouri) |
| SFI | Storytelling Foundation International |
| SFI | Super Food Ideas (Australian cooking magazine) |
| SFI | Software Fault Injection |
| SFI | servo-feed interface |
| SFI | Société Française d'Ingénierie (French: French Society of Engineering) |
| SFI | Skipsteknisk Forskningsinstitutt (Ship Research Institute of Norway) |
| SFI | Single Frequency Interface |
| SFI | Sea Freeze Inc. |
| SFI | Special Function Indicator (SABRS) |
| SFI | Single Float Image (Colorado State University) |
| SFI | Scanner Fiber Optic Interface |
| SFI | Star Field Image |
| SFI | Special Flight Instrumentation |
| SFI | Specialist Fault Investigation (department at British Telecom for investigating faults) |
| SFI | Sun Fresh International (USA) |
| SFI | Student Faculty Interaction (various schools) |
| SFI | Society for Immunology (various locations) |
| SFI | Structured Finance International, LLC (Miami, FL) |
| SFI | Shoah Foundation Institute (University of Southern California) |
| SFI | Schusterman Foundation-Israel (Jerusalem, Israel) |
| SFI | Significant Financial Interest (disclosure requirement) |
| SFI | Sports Foundation, Inc. (New York) |