| Acronym | Definition |
|---|
| IEOA➣Indexed Effective Orifice Area |
| IEOA➣Island Equipment Owners Association (est. 1964; Canada) |
| IEOA➣International Equestrian Organisers' Alliance |
| IEOA➣Irish Exhibition Organisers Association (trade body; Dublin, Ireland) |
| IEOA➣Indiana Escort Owners Association (car club) |