| RPM | Revolutions Per Minute |
| RTO | Regional Transport Office/ Road Transport Office |
| RBL | Ratnakar Bank Limited |
| RTGS | Real-Time Gross Settlement |
| RSS | Rashtriya Swayamsevak Sangh |
| RSS | Really Simple Syndication |
| ROFL | Rolling On Floor Laughing |
| RDX | Research Department Explosive / Royal Demolition Explosive |
| RSVP | Repondez s'il vous plait |
| RADAR | Radio Detection And Ranging |
| RAM | Random Access Memory |
| RO | Reverse Osmosis |
| RBC | Red Blood Cell |
| RHD | Rheumatic Heart Disease |
| RNA | Ribonucleic Acid |
| RAW | Research and Analysis Wing |
| RT | Re-Tweet / Real Time |
| RIP | Rest In Peace |
| RIP | Routing Information Protocol |
| ROLF | Rolling On Floor Laughing |
| RAC | Regulatory Affairs Certification |
| RSA | Rivert-Shamir-Adleman |
| RFID | Radio-Frequency Identification |
| RBI Recruitment | Recruitment Reserve Bank of India Recruitment |
| RBI Grade B | Reserve Bank of India Grade B |
| RPSC | Rajasthan Public Service Commission |
| RRB NTPC | Railway Recruitment Board Non-Technical Popular Categories |
| RRB ALP | RRB Assistant Loco Pilot Exam |
| RRB Group D | Railway Recruitment Board Group D |
| RRB JE | The Railway Recruitment Board |
| RA | Rheumatoid Arthritis |
| RET Time Zone | Reunion Time (Standard Time) |
| ROTT Time Zone | Rothera Time (Standard Time) |
