| Abbreviation | Definition |
|---|---|
| RI | The Republic of Ireland |
| RIM | République Islamique de Mauritanie (Islamic Republic of Mauritania) |
| RMI | Republic of the Marshall Islands |
| RMS | Republik Maluku Selatan |
| RO | Romania |
| ROC | Republic Of China |
| ROC | Republic Of Cyprus |
| ROI | Republic Of India |
| ROI | Republic Of Ireland |
| ROLACA | Rest of Latin America and the Caribbean |
| ROT | Republic Of Texas |
| RP | Republic of the Philippines |
| RS | Republika Srpska |
| RSA | Republic of South Africa |
| RSFSR | Russian Soviet Federative Socialist Republic |
| RSK | Republic of Serbian Krayina |
| RSM | Repubblica di San Marino ( Republic Of San Marino) |
| RSM | Republic of San Marino |
| RU | Russian Federation |
| RVN | Republic of VietNam |