| Abbreviation | Definition |
|---|---|
| RW | Rwanda |
| RY | Republic of Yemen |
| S | Scotland |
| SA | Saudi Arabia |
| SA | South Africa |
| SAARC | South Asia Association of Regional Countries |
| SAF | South Africa |
| SANAPS | South African national Association of Progressive Sheriffs |
| SAR | South African Republic |
| SB | Solomon Islands |
| SC | Seychelles |
| SD | Sudan |
| SE | Sweden |
| SEMC | Southern and Eastern Mediterranean Countries |
| SEN | Senegal |
| SERBCRO | Serbian and Croatian |
| SEY | Seychelles Islands |
| SF | Suomi Finland |
| SFRY | Socialist Federal Republic of Yugoslavia |
| SG | Singapore |