| Abbreviation | Definition |
|---|---|
| RN | Renegade Nation |
| RN | Respect No |
| RNC | Respect No Countries |
| RO | Russian Orphan |
| ROISAP | UNESCO Regional Observatory of the Information Society in Asia Pacific |
| ROtI | Review of Outcomes to Impact |
| RPBA | Recovery and Peacebuilding Assessment |
| RPC | Regional Protection Control |
| RPF | Rehabilitation Project Force |
| RQN | Return of Qualified Nationals |
| RRA | Rahanweyne Resistance Army |
| RRP | Regional Response Plan |
| RSAA | Refugee Status Appeals Authority |
| RSRP | Rebuild Syria Reconstruction Program |
| RTFP | Regional Trade Facilitation Program |
| RTG | Royal Thai Government |
| RTOP | Responsibility TO Protect |
| RUNDA | Reserved United Nations Development Area |
| RVH | Research Vessel Heraclitus |
| SAARC | South Asian Association for Regional Cooperation |