| Acronym | Definition |
|---|
| SIF | As If |
| SIF | Schools Interoperability Framework |
| SIF | Social Investment Forum |
| SIF | Singapore International Foundation |
| SIF | Standard Interchange Format |
| SIF | Safety Instrumented Function |
| SIF | State Insurance Fund (Puerto Rican government agency) |
| SIF | Stress Intensity Factor |
| SIF | Selective Identification Feature |
| SIF | Sons of Italy Foundation |
| SIF | Svenska Industritjänstemannaförbundet (Swedish Industrial Workers Union) |
| SIF | Source Input Format |
| SiF | Sound Intermediate Frequency |
| SIF | Structural Integrity Field (Star Trek) |
| SIF | Seat In Front |
| SIF | State Investment Fund |
| SIF | Secours Islamique France (French: Islamic Relief France; est. 1992) |
| SIF | SONET Interoperability Forum |
| SIF | Stateful Inspection Firewall |
| SIF | Settlement in Full |
| SIF | Systems Integration Facility |
| SIF | Secondary Infertility |
| SIF | Service Information Field |
| SIF | SSDB Interchange Format |
| SIF | Short Interframe Space (networking) |
| SIF | Silkeborg If Fodbold (Danish soccer club) |
| SIF | Secret Internet Fatty |
| SIF | Security Information File |
| SIF | Systèmes d'Information Fluviale (French: River Information System) |
| SIF | Source Image Format |
| SIF | Signal Information Field |
| SIF | Spinal Injury Foundation (Westminster, CO) |
| SIF | Standard Simulator Database Interchange Format |
| SIF | Stumpy Induction Factor |
| SIF | SOGS Integration Facility |
| SIF | Signaux, Images et Formes (French: Signals, Images and Forms; signal processing) |
| SIF | Security Issues Forum |
| SIF | Scientific Instrument Formatter (NASA) |
| SIF | Silent Installation File (Microsoft) |
| SIF | Standard Interchange Facilities |
| SIF | Special Instruction Form |
| SIF | Software Input Form |
| SIF | SACDIN System Integration Facility |
| SIF | Surface Inlaid Fibre |
| SiF | Serious Injury Frequency |
| SIF | Student International Forum (various locations) |
| SIF | Store Integration Framework (middleware; IBM) |
| SIF | Special Investment Fund (various locations) |
| SIF | Subsequent Injury Fund (various locations) |
| SIF | Serviço de Inspeção Federal (Portuguese: Federal Inspection Service; Brazil) |