| R&D | Research and Development |
| R.s.v.p. | Respondez s'il vous Plant (Reply if you please) |
| RADAR | Radio Detection and Ranging |
| RAM | Random Access Memory |
| RAW | Research & Analysis Wing |
| RBI | Reserve Bank of India |
| ROM | Read Only Memory |
| RPM | Revolutions Per Minute |
| RSS | Rashtriya Swayam Sewak Sangha |
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