| Acronym | Meaning |
 | RAD | Radiation Dosage |
| RAD | Radiation Equivalent Dose |
| RAD | Radius |
| RAD | Roentgen Absorbed Dosage |
| RADAR | Radio Detecting And Ranging |
| RADCC | Radiation Control Center |
| RAE | Radio Astronomy Explorer |
| RAF | Requirements Analysis Form |
| RAG | Reusable Agenda |
| RAHF | Research Animal Holding Facility |
| RAI | Radar Altimeter Indicator |
| RAI | Rofl Attitude Indicator |
| RAL | ResPonsibiiitV Aslignment List |
| RALPH | Reduction And Acquisition Of Lunar Pulse Heights |
| RALT | Radar Altimeter |
| RAM | Radar Absorption Material |
| RAM | Random Access Memory |
| RAM | Random-access Memory |
| RAM | Research And Applications Module |
| RAM | Responsibility Assignment Matrix |
| RAMA | Recap And Movement Authorization |
| RANC | Radar Absorption Noise And Clutter |
| RANN | Research Applied To National Needs |
| RAPCON | Radar Approach And Control |
| RAPS | Right AFT Propulsion System |
| RAS | Requirements Allocation Sheet |
| RATCC | Radar Air Traffic Control Center |
| RAU | Remote Acquisition Unit |
| RAU | Remote Acquisition Unit |
| RAUIS | Remote Acquisition Unit Interconnecting Station |
| RAX | Remote Access Computing System |
| RAX | Remote Access Terminal |
| RB | Radar Beacon |
| RBA | Radar Beacon Antenna |
| RBC | Red Blood Cells |
| RBC | Rotating Beam Ceilometer |
| RBDE | Radar Bright Display Equipment |
| RBE | Radiation Biological Effectiveness |
| RBK | Right Bank |
| RBL | Right Buttock Line |
| RBMT | Retrospective BibliographieS On Magnetic Tape |
| RBN | Radio Beacon |
| RC | Range Command |
| RC | Rate Command |
| RC | Recovery Controller |
| RC | Recurring Cost |
| RC | Resistance-Capacitance |
| RC | Reverse Current |
| RC | Rotation Control |
| RCA | Radio Corporation Of America (SATCOM) |
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