| Abbreviation | Definition |
|---|---|
| RCV | Roll Call Vote |
| RCW | Russian Consulate Worker |
| RCZ | Resource Conservation Zone |
| RCZ | Rural Coastal Zone |
| RD | Requirement Directive |
| RD | Rural Development |
| RDA | Rare Disease Act Act of 2002, P.L. 107-280 |
| RDA | Records Disposition Authorization |
| RDA | Regional Delegate Alternate |
| RDA | Registration Details Application |
| RDC | Refusing to Develop Country |
| RDC | Regional Division Chief |
| RDCC | Research and Development Coordination Council |
| RDCRC | Rare Diseases Clinical Research Consortia |
| RDCRN | Rare Diseases Clinical Research Network |
| RDD | Research and Development Division |
| RDGL | Ruaral Development Loan and Grand Assistance |
| RDH | Research Document, Historical |
| RDML | Rear Admiral lower half |
| RDPP | Research, Development, and Public Policy |