| Acronym | Definition |
|---|
| STI | Sexually Transmitted Infection |
| STI | Straits Times Index |
| STI | Science, Technology and Industry |
| STI | Subaru Tecnica International (Tokyo, Japan) |
| STI | Superconductor Technologies Inc. |
| STI | Suntrust Banks, Inc (stock symbol) |
| STI | Scientific and Technical Issues (working group) |
| STI | Subject to Inspection (real estate) |
| STI | Sciences et Technologies Industrielles (French: Industrial Science and Technology) |
| STI | Software Technology, Inc. |
| STI | Swiss Tropical Institute |
| STI | Sciences et Techniques Industrielles (French: Science and Technology Industries) |
| STI | Shallow Trench Isolation |
| STI | Science, Technology and Innovation |
| STI | Single Table Inheritance |
| STI | St. Ignance (Amtrak station code; St. Ignance, MI) |
| STI | Symbol Technologies, Inc. |
| STI | System Tray Icon (software) |
| STI | Standard Text Interface |
| STI | Set Interrupt |
| STI | Self Timed Interface |
| STI | Solutions Technology Integrator |
| STI | Single Target Instruction |
| STI | Still Image |
| STI | Subaru Tecnica International |
| STI | Simple Technology Incorporated |
| STI | Sustainable Travel International |
| STI | Steel Tank Institute |
| STI | Speech Transmission Index |
| STI | Short Term Incentive (structured or unstructured bonus payment) |
| STI | Summer Transportation Institute (educational program; US DOT) |
| STI | Structured Treatment Interruption |
| STI | Semantic Technology Institute |
| STI | Set Interrupt Flag |
| STI | Sony, Toshiba, IBM (Cell processor alliance) |
| STI | Subaru Technica International |
| STI | Screw Thread Insert |
| STI | Sports Technology International (various locations) |
| STI | Soft Tissue Injury |
| STI | Sega Technical Institute (video game development division; Sega) |
| STI | Scientific & Technical Information |
| STI | Serv Trayvou Interverrouillage (French security company) |
| STI | Sarkes Tarzian, Inc. (broadcasting; Indiana) |
| STI | Side Turn Indicator (automotive side blinker) |
| STI | Soft Tissue Infection (medicine) |
| STI | Star Trek Insurrection (movie) |
| STI | Science and Technology International |
| STI | Software Testing Institute |
| STI | Security Threat Information (computer security; UN) |
| STI | Shimano Total Integration (bicycle shifting system) |
| STI | Still Image Architecture |
| STI | Scientific Technologies Incorporated |
| STI | So That's It? |
| STI | System Technology Institute |
| STI | Specialized Transportation, Inc. |
| STI | Systemic-Theoretical Instruction (education) |
| STI | Strategic Treatment Interruption |
| STI | Strategic Technologies for the Internet |
| STI | Sports Travel International (UK) |
| STI | Service des Thérapies Innovantes (French: Department of Innovative Therapies) |
| STI | Santiago, Dominican Republic - Municipal (Airport Code) |
| STI | Standard Tape Interface |
| STI | Sous-Traitance Industrielle (French: Industrial Subcontracting) |
| STI | Singapore Regional Training Institute (IMF) |
| STI | Seymour Tubing, Inc. (Seymour, IN) |
| STI | Semiconductor Technologies & Instruments |
| STI | Steel Tube Institute of North America |
| STI | Software Thread Integration (computer programming) |
| STI | Simulation Technologies, Inc. |
| STI | Safety Training Institute |
| STI | Service de Santé au Travail de l'Industrie (Luxembourg) |
| STI | Scaffold Training Institute |
| STI | Strategic Traffic Information |
| STI | Surveillance Test Interval |
| STI | Suomen Teologinen Instituutti (Finland) |
| STI | Segmenting Track Identifier |
| STI | Structured Telephone Interview |
| STI | Software Technology Integration |
| STI | Special Technical Instruction (Royal Australian Air Force) |
| STI | Space Technology Initiative |
| STI | Spillman Technologies, Inc (public safety software) |
| STI | Subaru Turbo Israel (Israel) |
| STI | Stationary Target Indicator |
| STI | Summer Theater Institute |
| STI | Subterranean Target Identification |
| STI | Summing Telephone Interface |
| STI | Shared Trigger Interaction |
| STI | Straight Times Interactive (Singapore) |
| STI | Spectra Technology Inc. |
| STI | Saulog Transit, Inc. |
| STI | Spacetech International (Germany) |
| STI | Semantic Type Indexing |
| STI | Simtec Triad Ionate |
| STI | Sunny Tech Inc. (computer company) |
| STI | Subrate Transmit Interchange (AT&T) |
| STI | Syktyvkar Timber Institute (Komi Republic, Russia) |
| STI | Standard Treatment Interruption |
| STI | Short-Time Integration |
| STI | Semko Technology Industries |
| STI | Shanghai Tea Institute |
| STI | Standard Terminal Interface |
| STI | Servicewide Technical Infrastructure |
| STI | Search Technology, Incorporated (Norcross, GA) |
| STI | Signal of Technical Interest |
| STI | Subaru Technica Institute |