Parties and Range States
| Title | Status | Status date | CMS Party number | Region |
|---|---|---|---|---|
| Saudi Arabia | MOU Signatory | 2017 | 036 | Asia |
| Senegal | MOU Signatory | 2010 | 027 | Africa |
| Serbia | Range State | 108 | Europe | |
| Seychelles | Range State | 092 | Africa | |
| Sierra Leone | Range State | AM | Africa | |
| Singapore | Range State | Asia | ||
| Slovenia | Range State | 057 | Europe | |
| Solomon Islands | Range State | AM | Oceania | |
| Somalia | MOU Signatory | 2016 | 020 | Africa |
| South Africa | MOU Signatory | 2011 | 038 | Africa |
| Spain | Range State | 017 | Europe | |
| Sri Lanka | MOU Signatory | 2017 | 033 | Asia |
| Sudan | MOU Signatory | 2014 | AM | Africa |
| Suriname | Range State | South & Central America & The Caribbean | ||
| Sweden | MOU Signatory | 2014 | 001 | Europe |
| Syrian Arab Republic | MOU Signatory | 2014 | 082 | Asia |
| Thailand | Range State | AM | Asia | |
| Timor-Leste | Range State | Oceania | ||
| Togo | MOU Signatory | 2010 | 048 | Africa |
| Tonga | Range State | AM | Oceania |