IWSA
| Acronym | Definition |
|---|---|
| IWSA | Interscan Web Security Appliance |
| IWSA | Integrated Waste Services Association |
| IWSA | International Water Supply Association |
| IWSA | InterScan Web Security Appliance (Trend Micro Incorporated) |
| IWSA | International Water Services Association (now International Water Association) |
| IWSA | Irish Water Safety Association (est. 1945; Galway, Ireland) |
| IWSA | International Winter Swimming Association |
| IWSA | In-Warranty Support Agreement (Trane) |
| IWSA | Independent Washroom Services Association (UK) |