| Abbreviation | Definition |
|---|---|
| RDH | Recirculating Document Handler |
| RDL | Research and Development Laboratory |
| RDM | Real-Time Data Manager |
| RDM | Research Double Module - SPACELAB |
| RDM | Rapid Delivery Methodology |
| RDMA | Remote Direct Memory Access |
| RDMS | Registered Diagnostic Medical Sonographer |
| RDP | Remote Desktop Protocol |
| RDP | Research and Development Project |
| RDR | Raw Data Recorder |
| RDRAM | Rambus Dynamic Random Access Memory |
| RDS | Radio Data System |
| RDS | Rocketdyne Digital Simulator |
| RDSS | Radio Determination Satellite service |
| RDT | Remote Data Transmitter |
| RDT | Rapid Decompression Test |
| RDT | Reliability Demonstration Testing |
| RDTA | Reliability Development Test Article |
| RDTR | Research Division Technical Report |
| RDW | Reference Divider Word |
| RDW | Red Cell Distribution Width |
| RE | Revised Estimate |
| RE | Reproductive Endocrinology |
| RE | Real And Equal |
| RE | Reproductive Endocrinologist |
| REA | Real Estate Agent |
| REACH | "Registration, Evaluation and Authorisation of Chemicals" |
| REAL | Revised European American Lymphoma |
| REAL | Relevant Experience And Learning |
| REAP | Resource Efficient Agricultural Production |
| REBC | Registered Employee Benefits Consultant |
| REC | Rural Eletrification Corporation |
| REC | Recruitment And Employment Confederation |
| REC | Regional Environment Centre |
| RECOVER | Recover a damaged file |
| REE | Real Effective Exchange |
| REER | Real Effective Exchange Rate |
| ref | with reference to |
| REHAB | Re-Habilitative Therapy |
| REHEX | Regional Human Exposure |
| REHP | Registered Environmental Health Professional |
| REM | Randomly Evolving Machinecode |
| REM | REMark (a Batch command) |
| REN | Re- Name |
| REN | REMark (a Batch command) |
| RENAME | Rename a file |
| REO | Re Employment Options |
| REO | Regional Event Organiser |
| REP | Repeat |
| REPE | Repeat While Equal |