The acronym WSI may refer to:

• Wafer-scale integration, a technique for building large integrated circuits
• Wall Street Institute, the former name of Wall Street English, an English language education company
• Walter Schottky Institute, a research center at the Technical University of Munich
• Water Safety Instructor, a person qualified to teach swimming lessons
• Weather Services International, a sister company to The Weather Channel, specializing in weather data and software
• Weather Stress Index, a relative measure of weather conditions
• Web Services Interoperability, Organization (WS-I), computer industry consortium
• Western Sydney Airport – the IATA code of this under-construction airport in Sydney
• Western Sydney Institute of TAFE, college institute in New South Wales
• Winter Soldier Investigation, inquiry into war crimes resulting from United States policies in the Vietnam War
• Wojskowe Służby Informacyjne, Poland's former military intelligence services
• World Security Institute, think-tank for independent research and journalism on global affairs
• World Sindhi Institute, a human rights organization based in Washington, D.C., United States
• Wrimare School Inc., a private school in Obando, Bulacan, Philippines
• Written Scheme of Investigation, a document outlining a property developer's obligation to conduct archaeological research in England's planning system
• Whole Slide Imaging, refers to scanning a complete microscope slide and creating a single high-resolution digital file.

This disambiguation page lists articles associated with the title WSI.
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