| Acronym | Definition |
|---|
| IRWM➣Integrated Regional Water Management (grant program; California) |
| IRWM➣Irish Recycling & Waste Management |
| IRWM➣Integrated Regional Wetland Monitoring (California) |
| IRWM➣Integrated Resource and Waste Management (EU) |
| IRWM➣International Rainbow Week Movement (sports) |