| Acronym | Definition |
|---|
| IWCA➣International Window Cleaning Association |
| IWCA➣International Writing Centers Association |
| IWCA➣Independent Working Class Association (UK) |
| IWCA➣International Workshop on Cometary Astronomy |
| IWCA➣Idaho Weed Control Association |
| IWCA➣Irish Wolfhound Club of America, Inc. (Tabernacle, NJ) |
| IWCA➣International World Calendar Association |
| IWCA➣International Women's Contact Antwerp (Belgium) |
| IWCA➣Inside Wiring Cable |