International Organizations and Groups | Aim - Objective |
| Permanent Court of Arbitration (PCA) | to facilitate the settlement of international disputes |
| Rio Group (RG) | to consult on regional Latin American issues |
| Schengen Convention | |
| Second World | Second World |
| Secretariat of the Pacific Community (SPC) | to serve island development in 22 Pacific countries; to develop technical assistance and professional, scientific, and research support; to build planning and management capability |
| Shanghai Cooperation Organization (SCO) | to combat terrorism, extremism, and separatism; to safeguard regional security through mutual trust, disarmament, and cooperative security; and to increase cooperation in political, trade, economic, scientific and technological, cultural, and educational fields |
| socialist countries | socialist countries |
| South | South |
| South American Community of Nations (CSN) | to coordinate common policies regarding multilateral organizations, to integrate physical infrastructure, and to consolidate the merger of CAN and Mercosur |
| South Asia Co-operative Environment Program (SACEP) | to promote regional cooperation in South Asia in the field of environment, both natural and human, and on issues of economic and social development; to support conservation and management of natural resources of the region |
| South Asian Association for Regional Cooperation (SAARC) | to promote economic, social, and cultural cooperation |
| South Pacific Forum (SPF) | South Pacific Forum (SPF) |
| South Pacific Regional Trade and Economic Cooperation Agreement (Sparteca) | to redress unequal trade relationships of Australia and New Zealand with small island economies in the Pacific region |
| Southeast European Cooperative Initiative (SECI) | to encourage cooperation among participating states and to facilitate their integration into European structures |
| Southern African Customs Union (SACU) | to promote free trade and cooperation in customs matters |
| Southern African Development Community (SADC) | to promote regional economic development and integration |
| Southern Cone Common Market (Mercosur) or Southern Common Market | to increase regional economic cooperation |
| Third World | Third World |