| Acronym | Definition |
|---|
| WSI➣Water Safety Instructor |
| WSI➣Wall Street Institute |
| WSI➣Water Systems, Inc. (various locations) |
| WSI➣Window Set Interval |
| WSI➣Web Server Integration |
| WSI➣Wireless Strategic Initiative |
| WSI➣Wirtschafts- und Sozialwissenschaftliches Institut (German: Institute for Economic and Social Science; Germany) |
| WSI➣Wilhelm Schickard Institut (German institute) |
| WSI➣Wackenhut Services Inc. (Palm Beach Gardens, FL) |
| WSI➣Wafer Scale Integration |
| WSI➣Web Services Interoperability |
| WSI➣Web Services Interface (software) |
| WSI➣World Security Institute (Washington, DC) |
| WSI➣World Sindhi Institute (Pakistan) |
| WSI➣Weather Services International Corporation |
| WSI➣Workplace Skills Initiative (Industry Canada) |
| WSI➣Welfare State International |
| WSI➣Whole Sky Image (meteorology) |
| WSI➣Workforce Safety Insurance (North Dakota) |
| WSI➣Web Services Initiative (various organizations) |
| WSI➣Written Scheme of Investigation (document prepared as part of archaeological fieldwork) |
| WSI➣Wachovia Securities, Inc. (banking) |
| WSI➣Weapon System Integration |
| WSI➣Whole School Initiative (various locations) |
| WSI➣Web Services Internationalization |
| WSI➣Wireless Systems International |
| WSI➣Web Services Intermediary |
| WSI➣Whole Schools Institute |
| WSI➣Water Soluble Index |
| WSI➣Warfare Studies Institute |
| WSI➣Wordtext Systems Incorporated |
| WSI➣Wellstart International |
| WSI➣Weapons System Information Manual |
| WSI➣Waste-Spark Ignition |
| WSI➣Woman Sergeant Instructor |
| WSI➣War Service Increment (UK) |