| Acronym | Definition |
|---|
| URR➣Urea Reduction Ratio (urinary dialysis laboratory data) |
| URR➣Ultima Ratio Regum |
| URR➣Upstream Regulatory Region (human papillomavirus) |
| URR➣Underground Railroad |
| URR➣Ultimate Recoverable Reserves (natural resources) |
| URR➣Ultimately Recoverable Resources (oil reserves) |
| URR➣Union Railroad Company |
| URR➣Unconstrained Requirements Report |
| URR➣Unscheduled Removal Rate |
| URR➣Ultra Reliable Radar |
| URR➣Ugly Radio Rebellion (band) |
| URR➣Unit Readiness Report |
| URR➣Unexpired Risk Reserve |
| URR➣Unpaid Return Rate |
| URR➣Upper Hatch Rail Retracted Auxiliary |
| URR➣UN Roulement Regiment (UK military) |
| URR➣Ultra-Reliable Router |
| URR➣Utilities External Review (board) |
| URR➣Unresourced Requirement |
| URR➣User Readiness Review |