| Abbreviation | Definition |
|---|---|
| SH | Saint Helena |
| SI | Sandwich Islands |
| SI | Slovenia |
| SIOA | Stop Islamization Of America |
| SIOB | Stop Islamization Of Britain |
| SJ | Svalbard and Jan Mayen Islands |
| SK | Slovak Republic |
| SKD | Ska Kid Dan |
| SKN | Saint Kitts and Nevis |
| SKN | St. Kitts- Nevis |
| SKO | South Korea |
| SL | Sierra Leone |
| SL | Sri Lanka |
| SM | Saint Martin |
| SM | San Marino |
| SMIIC | Standard and Metrology Institute for Islamic Countries |
| SMIIC | Standards and Metrology Institute for Islamic Countries |
| SMIIC | Standards and Metrology Institute for the Islamic Countries |
| SN | Senegal |
| SO | Somalia |