[c mediumvioletred] (as used in expressions)
North Atlantic Treaty Organization
Organization of Petroleum Exporting Countries
Food and Agriculture Organization
health maintenance organization
International Labour Organization
international organization
{{link=International Organization for Standardization">International Organization for Standardization
International Refugee Organization
National Military Organization
National Organization for Women
nongovernmental organization
Organization of African Unity
Organization of American States
South West Africa People's Organization
Southeast Asia Treaty Organization
Warsaw Treaty Organization
World Health Organization
World Trade Organization
Central Treaty Organization
Baghdad Pact Organization
Middle East Treaty Organization
Palestine Liberation Organization
United Nations Educational Scientific and Cultural Organization