| Country | Region | Contracting Party | |
|---|---|---|---|
| 161 | Somalia | Africa | Yes |
| 162 | South Africa | Africa | No |
| 163 | South Sudan | Africa | Yes |
| 164 | Spain | Europe | Yes |
| 165 | Sri Lanka | Asia | Yes |
| 166 | Sudan | Near East | Yes |
| 167 | Suriname | Latin America and the Caribbean | No |
| 168 | Sweden | Europe | Yes |
| 169 | Switzerland | Europe | Yes |
| 170 | Syrian Arab Republic | Near East | Yes |
| 171 | Tajikistan | Near East | No |
| 172 | Thailand | Asia | Only Signature |
| 173 | Timor-Leste | Asia | No |
| 174 | Togo | Africa | Yes |
| 175 | Tonga | South West Pacific | Yes |
| 176 | Trinidad and Tobago | Latin America and the Caribbean | Yes |
| 177 | Tunisia | Africa | Yes |
| 178 | Turkmenistan | Near East | No |
| 179 | Tuvalu | South West Pacific | Yes |
| 180 | Türkiye | Europe | Yes |