| Acronym | Definition |
|---|
| IRgA➣International Reprographic Association |
| IRgA➣Instituto Rio Grandense do Arroz (Brazil) |
| IRgA➣Indian River Guides Association (est. 2000; Palm Bay, FL) |
| IRgA➣Infra-Red Gas Analyzer |
| IRgA➣Iron-Regulated Gene A |
| IRgA➣International Recreation Go-Kart Association |