| Acronym | Definition |
|---|
| RDU | Rank-Dependent Utility |
| RDU | Regional Distribution Unit |
| RDU | Rear Drive Unit |
| RDU | Remote Display Unit |
| RDU | Rapid Deployment Unit (Teleware) |
| RDU | Rassemblement pour la Démocratie et l'Unité (French: Rally for Democracy and Unity, Mauritania) |
| RDU | Renal Dialysis Unit |
| RDU | Reasonable Drivers Unanimous |
| RDU | Receipt and Despatch Unit (US Navy) |
| RDU | Refrigerated Detector Unit |
| RDU | Remote Diagnostic Unit (Bendix ABS) |
| RDU | Regional Decision Units |
| RDU | Reptiles Down Under (Australia) |
| RDU | Raleigh/Durham, NC, USA - Raleigh Durham International Airport (Airport Code) |
| RDU | Restricted Duties |