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| O | OAPEC | Organization of Arab Petroleum Exporting Countries |
| OAS | Organization of American States | |
| OAU | Organization of African Unity | |
| OCAM | Afro-Malagasy and Mauritian Common Organization | |
| ODECA | Organization of Central American States | |
| OECD | Organization for Economic Cooperation and Development | |
| OECS | Organization of Eastern Caribbean States | |
| OIC | Organization of the Islamic Conference | |
| OMVS | Organization for the Development of the Senegal River Valley | |
| OPEC | Organization of Petroleum Exporting Countries | |
| P | PAHO | Pan American Health Organization |
| S | SAARC | South Asian Association for Regional Cooperation |
| SADCC | Southern African Development Coordination Conference | |
| SELA | Latin American Economic System | |
| SPC | South Pacific Commission | |
| SPEC | South Pacific Bureau for Economic Cooperation | |
| SPF | South Pacific Forum | |
| T | TC | Trusteeship Council (UN) |
| TDB | Trade and Development Board (UN) | |
| U | UDEAC | Central African Customs and Economic Union |
| UEAC | Union of Central African States | |
| UN | United Nations | |
| UNCTAD | UN Conference on Trade and Development | |
| UNDP | UN Development Program | |
| UNESCO | UN Educational, Scientific, and Cultural Organization | |
| UNICEF | UN Children's Fund | |
| UNIDO | UN Industrial Development Organization | |
| UPEB | Union of Banana Exporting Countries | |
| UPU | Universal Postal Union (UN) | |
| W | . . . | Warsaw Pact |
| WCL | World Confederation of Labor | |
| WEU | Western European Union | |
| WFC | World Food Council (UN) | |
| WFTU | World Federation of Trade Unions | |
| WHO | World Health Organization (UN) | |
| WIPO | World Intellectual Property Organization (UN) | |
| WMO | World Meteorological Organization (UN) | |
| WPC | World Peace Council | |
| WSG | International Wool Study Group | |
| WTO | World Tourism Organization |
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