| Abbreviation | Definition |
|---|---|
| SOE | State-Owned Enterprises |
| SOI | State Of Israel |
| Sp | Spain |
| SPB | St. Petersburg |
| SR | Slovak Republic |
| SR | Suriname |
| SRI | Sri Lanka |
| SSSR | Soyuz Sovietskiy Sotsialisticheskiy Respublik |
| ST | Saint Tome and Principe |
| STARGO | Strengthening Aquatic Resource Governance |
| STIB | Brussels Intercommunal Transport Company (French Acronym - STIB) |
| STP | Sao Tome e Principe |
| SU | Soviet Union |
| SU | Soviet Union (former USSR, now Russia) |
| SUD | Sudan |
| SUI | SUIsse |
| SV | El Salvador |
| SV | Sverige (Sweden) |
| SVG | Saint Vincent and the Grenadines |
| SVK | Slovak Republic |