- Saint Barthélemy – Collectivity of Saint Barthélemy (French overseas collectivity)
- Saint Helena (UK overseas territory)
- Saint Kitts and Nevis – Federation of Saint Christopher and Nevis
- Saint Lucia
- Saint Martin – Collectivity of Saint Martin (French overseas collectivity)
- Saint Pierre and Miquelon – (French overseas collectivity)
- Saint Vincent and the Grenadines
- Samoa – Independent State of Samoa
- San Marino – Most Serene Republic of San Marino
- São Tomé and Príncipe – Democratic Republic of São Tomé and Príncipe
- Saudi Arabia – Kingdom of Saudi Arabia
- Senegal – Republic of Senegal
- Serbia – Republic of Serbia
- Seychelles – Republic of Seychelles
- Sierra Leone – Republic of Sierra Leone
- Singapore – Republic of Singapore
- Slovakia – Slovak Republic
- Slovenia – Republic of Slovenia
- Solomon Islands
- Somalia
- Somaliland – Republic of Somaliland
- South Africa – Republic of South Africa
- South Ossetia – Republic of South Ossetia
- Spain – Kingdom of Spain
- Sri Lanka – Democratic Socialist Republic of Sri Lanka
- Sudan – Republic of the Sudan
- Suriname – Republic of Suriname
- Svalbard (Territory of Norway)
- Swaziland – Kingdom of Swaziland
- Sweden – Kingdom of Sweden
- Switzerland – Swiss Confederation
- Syria – Syrian Arab Republic
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