| Acronym | Definition |
|---|
| IWA | International Webmasters Association |
| IWA | International Water Association |
| IWA | International Workers Association (est. 1922) |
| IWA | Inland Waterways Association (UK) |
| IWA | Integrated Windows Authentication |
| IWA | International Wrestling Association |
| IWA | Ivanova (Russia) |
| IWA | Incarnate Word Academy |
| IWA | International Windsurfing Association |
| IWA | Williams-Gateway Airport (now Phoenix-Mesa Gateway Airport) |
| IWA | Institute of World Affairs (Washington, DC) |
| IWA | International Webcasting Association |
| IWA | Independent Wrestling Association Mid-South (est. 1996) |
| IWA | Industrial, Wood and Allied Workers of Canada (Union) |
| IWA | Indian Workers Association (UK) |
| IWA | Imaging and Workflow Automation (invoicing) |
| IWA | Interactive Web Application |
| IWA | International Wheat Agreement |
| IWA | Institute for Welsh Affairs (Cardiff, Wales, UK) |
| IWA | Indigenous World Association |
| IWA | Illinois Wheat Association |
| IWA | International Wine Accessories, Inc. |
| IWA | Institute Women's Association (Church of Jesus Christ of Latter-day Saints single women group) |
| IWA | Idaho Women for Agriculture |
| IWA | Internal Work Agreement |
| IWA | Indian Wine Academy |
| IWA | Individual Work Authorization |
| IWA | Interactive Weather Analysis (CAFWSP) |
| IWA | International Women's Association (various locations) |
| IWA | Industrial Wind Action (advocacy group) |