| IRRI | Immigrant and Refugee Research Institute 
| Others |
| IRRI | Independent Research in Responsible Investment
| Others |
| IRRI | Industrial Relations Research Institute
| Others |
| IRRI | Institut Royal des Relations Internationales
| Others |
| IRRI | International Refugee Rights Initiative
| Others |
| IRRI | International Refugees Rights Initiative
| Others |
| IRRI | International Renewable Resources Institute
| Others |
| IRRI | International Resources and Recycling Institute
| Others |
| IRRI | International Rice Research Institute
| Others |
| IRRI | International Rice Research Institution
| Others |
| IRRI | Interstate Refrigerant Recovery INC
| Others |