| Acronym | Definition |
|---|
| IRRF➣Imposto de Renda Retido na Fonte (Payer-retained Income Tax; Brazil) |
| IRRF➣Iraqi Relief and Reconstruction Fund |
| IRRF➣International Robot Racing Federation |
| IRRF➣Illinois Reference/Resource Families (genetics) |
| IRRF➣Integrated Resource Recovery Facility (composting; Richmond, CA) |
| IRRF➣International Relief Friendship Foundation |