| Abbreviation | Definition |
|---|---|
| IWAI | Inland Waterways Association of Ireland |
| IWAM | International Women Association of Malawi |
| IWAN | International Women's Association Namibia |
| IWAY | International Women's Association of Yerevan |
| IWBA | Indonesia Woodball Association |
| IWBA | Injured Workers Bar Association |
| IWBA | International Waterfowl Breeders Association |
| IWEA | Illinois Water Environment Association |
| IWEA | Illinois Wind Energy Association |
| IWEA | Indiana Water Environment Association |
| IWEA | Iowa Wind Energy Association |
| IWEA | Irish Wind Energy Association |
| IWMA | International Water Mist Association |
| IWMA | International wire and machinery association |
| IWMA | International Working Men's Association |
| IWPA | Indian Wind Power Association |
| IWPA | Israel Wine Producers Association |
| IWSA | Indian Women Scientists Association |
| IWSA | Indian Women Scientists' Association |
| IWSA | Indiana Water Ski Association |