| Acronym | Definition |
|---|
| IWR | Institute for Water Resources |
| IWR | Internationales Wirtschaftsforum Regenerative Energien (German: International Economic Platform for Renewable Energies) |
| IWR | Input Output Write |
| IWR | Impaired Waters Rule (Florida) |
| IWR | Interactive Web Response |
| IWR | Intelligent Word Recognition |
| IWR | Internet Weather Report |
| IWR | Institute for Water Research |
| IWR | Isolated Word Recognition |
| IWR | Independent Wrestling Revolution (professional wrestling circuit) |
| IWR | I Will Report |
| IWR | Internet Weekly Report (blog) |
| IWR | Integral Water Repellent (masonry mortar) |
| IWR | Institute for Wood Research |
| IWR | Internal Work Request |
| IWR | Inter-Works Requisition |