| IWRC | Illinois Water Resources Center 
| Others |
| IWRC | Independent Wire Rope Core
| Others |
| IWRC | Indian Water Rights Coalition
| Others |
| IWRC | INRA (Inland Northwest Research Alliance) Water Resources Consortium
| Others |
| IWRC | International Water Resources Conference
| Others |
| IWRC | International Waters Resource Centre
| Others |
| IWRC | International Wildlife Recovery Center
| Others |
| IWRC | International Wildlife Rehabilitation Council
| Others |
| IWRC | International Winter Road Congress
| Others |
| IWRC | Iowa Waste Reduction Center
| Others |