International Organizations and Groups | Aim - Objective |
| Organization of Arab Petroleum Exporting Countries (OAPEC) | to promote cooperation in the petroleum industry |
| Organization of Eastern Caribbean States (OECS) | to promote political, economic, and defense cooperation |
| Organization of Petroleum Exporting Countries (OPEC) | to coordinate petroleum policies |
| Organization of the Islamic Conference (OIC) | to promote Islamic solidarity in economic, social, cultural, and political affairs |
| Pacific Islands Forum (PIF) | to promote regional cooperation in political matters |
| Paris Club | to provide a forum for debtor countries to negotiate rescheduling of debt service payments or loans extended by governments or official agencies of participating countries; to help restore normal trade and project finance to debtor countries |
| Partnership for Peace (PFP) | to expand and intensify political and military cooperation throughout Europe, increase stability, diminish threats to peace, and build relationships by promoting the spirit of practical cooperation and commitment to democratic principles that underpin NATO; program under the auspices of NATO |
| Permanent Court of Arbitration (PCA) | to facilitate the settlement of international disputes |
| Rio Group (RG) | to consult on regional Latin American issues |
| Schengen Convention | to allow free movement within an area without internal border controls |
| 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 |