| Acronym | Definition |
|---|
| RCU | Respiratory Care Unit (various locations) |
| RCU | Remote Control Unit |
| RCU | Read Copy Update |
| RCU | Remote Control Utility |
| RCU | Rack Controller Unit |
| RCU | Regional Coordinating Unit |
| RCU | Royal Credit Union (various locations) |
| RCU | Research Coordinating Unit (various organizations) |
| RCU | Radio Control Unit |
| RCU | Remote Concentrator Unit |
| RCU | Requisition Control Unit (US Navy) |
| RCU | Radio Channel Unit |
| RCU | Refugee Coordination Unit (Nepal) |
| RCU | Regional Cadet Unit (Australia) |
| RCU | Room Control Unit |
| RCU | Rate Construction Unit |
| RCU | Retto Colite Ulcerosa |
| RCU | Radio Contact Underground (French Internet radio station) |
| RCU | Risk Control Unit (various companies) |
| RCU | Radar Control Unit |
| RCU | Revelar Connection Utility (Revelar, Inc.) |
| RCU | Reserve Component Unit |
| RCU | Refrigeration Control Unit |
| RCU | Restrict Casual Use |
| RCU | Remote Carrier Urban |
| RCU | Relocatable Code Unit |
| RCU | Residual Calibration Uncertainty |
| RCU | Ring Concentrator Unit |
| RCU | Remote Converter Unit |
| RCU | Rocket Countermeasure Unit |
| RCU | Rugby Club Uzetien (French rugby club) |
| RCU | Rapid Cooling Unit |
