| Abbreviation | Definition |
|---|---|
| RNA | Ribonucleic Acid |
| RNA | Efferent Renal Nerve Activity |
| RNBC | Residuary Non-Banking Company |
| RNC | Registered Nurse Certifie |
| RND | Random Number |
| RNDIS | Remote Network Driver Interface Specification |
| RNE | Return if Not Equal |
| RNF | Residence Not Flag |
| RNFA | Registered Nurse First Assistant |
| RNFL | Retinal Nerve Fiber Layer |
| RNGF | Rhodamine-nerve Growth Factor |
| RNO | Resident Naval Officer |
| RNO | Recruitment Networking Online |
| RNR | Royal Naval Reserve |
| RNTCP | Revised National Tuberculosis Control Programme |
| RNU | Radiology- Nuclear Medicine |
| RNV | Radio- Nuclear Ventriculography |
| RO | Reverse Osmosis |
| Roads | Arizona Transportation Information System |
| ROBERT | Rocket Borne Emergency Radio Transmitter |
| ROC | Restore Old Color |
| ROC | Report On Carcinogens |
| ROC | Registrar of Companies |
| ROCK | Reaching Out To Cancer Kids |
| ROF | Registered Orthotic Fitter |
| ROG | Really Old Guy |
| ROI | Return on Investment |
| ROI | Rate Of Income |
| ROIO | Record Of Indeterminate Origin |
| ROL | Rotate Left |
| ROL | Rotate Output Left |
| ROM | Read-Only Memory |
| ROP | Regional Occupation Program |
| ROR | Rotate Right |
| ROR | Retail Office Residential |
| ROS | Run Of Stack |
| RP | Register Pair |
| RP | Rotate Programmers |
| RP | Radical Prostatectomy |
| RP | Resignation Permitted |
| RP | Reprocessed Plastics |
| RPA | Rupee Payment Area |
| RPA | Real Property Administrator |
| RPA | Record and Playback Assembly |
| RPA | Request for Procurement Action |
| RPA | Rwandan Patriotic Army |
| RPBS | Repatriation Pharmaceutical Benefits Scheme |
| RPC | Remote Procedure Call |
| RPC | Registered Professional Counselor |
| RPC | Remote Power Controller |