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The United Nations System consists of the United Nations' six principal bodies (the General Assembly, Security Council, Economic and Social Council (ECOSOC), Trusteeship Council, International Court of Justice (ICJ), and the UN Secretariat),^[1] the Specialized Agencies and related organizations.^[2] The UN System includes subsidiary bodies such as the separately administered funds and programmes, research and training institutes, and other subsidiary entities.^[3]^[4] Some of these organizations predate the founding of the United Nations in 1945 and were inherited after the dissolution of the League of Nations.

The executive heads of some of the United Nations System, organizations and the World Trade Organization, which is not formally part of the United Nations System,^[5]^[6]^[7] have seats on the United Nations System Chief Executives' Board for Coordination (CEB).^[8] This body, chaired by the Secretary-General of the United Nations, meets twice a year to co-ordinate the work of the organizations of the United Nations System.

Six principal organs

The United Nations itself has six principal organs established by the Charter of the United Nations:

UN General Assembly — Deliberative assembly of all UN member states —	UN Secretariat — Administrative organ of the UN —	International Court of Justice — Universal court for international law —

May resolve non-compulsory recommendations to states or suggestions to the Security Council (UNSC); Decides on the admission of new members, following proposal by the UNSC; Adopts the budget; Elects the non-permanent members of the UNSC; all members of the Economic and Social Council; the UN Secretary-General (following their proposal by the UNSC); and the fifteen judges of the International Court of Justice (ICJ). Each country has one vote.	Supports the other UN bodies administratively (for example, in the organization of conferences, the writing of reports and studies and the preparation of the budget); Its chairperson—the UN Secretary-General—is elected by the General Assembly for a five-year mandate and is the UN's foremost representative.	Decides disputes between states that recognize its jurisdiction; Issues legal opinions; Renders judgment by relative majority. Its fifteen judges are elected by the UN General Assembly for nine-year terms.

UN Security Council — For international security issues —	UN Economic and Social Council — For global economic and social affairs —	UN Trusteeship Council — For administering trust territories (currently inactive) —

Responsible for the maintenance of international peace and security; May adopt compulsory resolutions; Has fifteen members: five permanent members with veto power and ten elected members.	Responsible for co-operation between states as regards economic and social matters; Co-ordinates co-operation between the UN's numerous specialized agencies; Has 54 members, elected by the General Assembly to serve staggered three-year mandates.	Was originally designed to manage colonial possessions that were former League of Nations mandates; Has been inactive since 1994, when Palau, the last trust territory, attained independence.

General Assembly

The United Nations General Assembly (UNGA/GA) consists of all United Nations Member States and meets in regular session once a year under a president elected from among the representatives. Its powers are to oversee the budget of the United Nations, appoint the non-permanent members to the Security Council, receive reports from other parts of the United Nations and make recommendations in the form of General Assembly Resolutions.^[10] It has also established a wide number of subsidiary organs.^[11]

Security Council

The United Nations Security Council (UNSC) is charged with the maintenance of international peace and security. Its powers, outlined in the United Nations Charter, include the establishment of peacekeeping operations, the establishment of international sanctions, and the authorization of military action. Its powers are exercised through United Nations Security Council resolutions.

The Security Council held its first ever session on 17 January 1946 at Church House, Westminster, London. Since its first meeting, the council, which exists in continuous session, has travelled widely, holding meetings in many cities, such as Paris and Addis Ababa, as well as at its current permanent home at the United Nations Headquarters in New York City.

There are 15 members of the Security Council, consisting of five veto-wielding permanent members (China, France, Russia, the United Kingdom, and the United States) and 10 elected non-permanent members with two-year terms. This basic structure is set out in Chapter V of the UN Charter. Security Council members must always be present at UN headquarters in New York so that the Security Council can meet at any time.

Economic and Social Council

The United Nations Economic and Social Council (ECOSOC) is responsible for co-ordinating the economic, social, and related work of 15 UN specialized agencies, their functional commissions and five regional commissions. ECOSOC has 54 members; it holds a four-week session each year in July. Since 1998, it has also held a meeting each April with finance ministers heading key committees of the World Bank and the International Monetary Fund (IMF). The ECOSOC serves as the central forum for discussing international economic and social issues, and for formulating policy recommendations addressed to member states and the United Nations System.^[12]

Secretariat

The United Nations Secretariat is headed by the United Nations Secretary-General, assisted by a staff of international civil servants worldwide. It provides studies, information, and facilities needed by United Nations bodies for their meetings. It also carries out tasks as directed by the UN Security Council, the UN General Assembly, the UN Economic and Social Council, and other U.N. bodies. The United Nations Charter provides that the staff is to be chosen by application of the "highest standards of efficiency, competence, and integrity," with due regard for the importance of recruiting on a wide geographical basis.

The charter provides that the staff shall not seek or receive instructions from any authority other than the UN. Each UN member country is enjoined to respect the international character of the secretariat and not seek to influence its staff. The secretary-general alone is responsible for staff selection.

Office of the United Nations High Commissioner for Human Rights (OHCHR)
United Nations Office on Drugs and Crime (UNODC)
United Nations Office of Internal Oversight Services (UN-OIOS)
United Nations Office for Disaster Risk Reduction (UNDRR, formerly UNISDR)

International Court of Justice

The International Court of Justice is the primary judicial organ of the United Nations. It is based in the Peace Palace in The Hague, Netherlands. Its main functions are to settle legal disputes submitted to it by states and to provide advisory opinions on legal questions submitted to it by duly authorized international organs, agencies, and the UN General Assembly.

Trusteeship Council

The United Nations Trusteeship Council, one of the principal organs of the United Nations, was established to ensure that trust territories were administered in the best interests of their inhabitants and of international peace and security. The trust territories—most of them are former mandates of the League of Nations or territories taken from nations defeated at the end of World War II—have all now attained self-government or independence, either as separate nations or by joining neighbouring independent countries. The last was Palau, formerly part of the Trust Territory of the Pacific Islands, which became a member state of the United Nations in December 1994.

Funds and programmes, research and training institutes, and other bodies

The separately administered funds and programmes, research and training institutes, and other subsidiary bodies are autonomous subsidiary organs of the United Nations.^[4]

Funds and programmes

Throughout its history the United Nations General Assembly has established a number of programmes and funds to address particular humanitarian and development concerns. These are financed through voluntary rather than assessed contributions. These bodies usually report to the General Assembly through an executive board. Only one UN programme has ever closed in the history of the organization, the United Nations Relief and Rehabilitation Administration (UNRRA), which ceased to exist in 1959 and was subsequently replaced by the UNHCR.

Each of the funds and programmes is headed by an executive director at the under-secretary-general level and is governed by an executive board. One former fund, the United Nations Development Fund for Women (UNIFEM), was merged with other elements of the United Nations System into a new organization, UN Women, in January 2011.

Programmes and funds of the United Nations
Acronyms	Agency	Headquarters	Head	Established	Comment
UNDP	United Nations Development Programme	New York City, United States	Achim Steiner	1965
UNICEF	United Nations Children's Fund	New York City, United States	Catherine M. Russell	1946
UNCDF	United Nations Capital Development Fund	New York City, United States	Marc Bichler	1966	Affiliated with the UNDP
WFP	World Food Programme	Rome, Italy	Cindy McCain	1963
UNEP	United Nations Environment Programme	Nairobi, Kenya	Inger Andersen	1972
UNFPA	United Nations Population Fund	New York City, United States	Natalia Kanem	1969
UN-HABITAT	United Nations Human Settlements Programme	Nairobi, Kenya	Maimunah Mohd Sharif	1978
UNV	United Nations Volunteers	Bonn, Germany	Richard Dictus	1978	Administered by UNDP

Research and training institutes

Various institutes were established by the General Assembly to perform independent research and training. One former institute, the International Research and Training Institute for the Advancement of Women (INSTRAW), was merged with other elements of the United Nations System into a new organization, UN Women, in January 2011.

United Nations Institute for Disarmament Research (UNIDIR)
United Nations Institute for Training and Research (UNITAR)
United Nations Interregional Crime and Justice Research Institute (UNICRI)
United Nations Research Institute for Social Development (UNRISD)
United Nations System Staff College (UNSSC)
United Nations University (UNU)

Secretariats of conventions

Convention on the Rights of Persons with Disabilities
UNCCD – United Nations Convention to Combat Desertification
UNFCCC – United Nations Framework Convention on Climate Change
UNCLOS – United Nations Convention on the Law of the Sea established bodies:
- ISA – International Seabed Authority
- ITLOS – International Tribunal for the Law of the Sea
UNCRC - United Nations Convention on the Rights of the Child

Other entities and bodies

Joint United Nations Programme on HIV/AIDS (UNAIDS)
International Trade Centre (ITC)
United Nations Office for Project Services (UNOPS)
United Nations Conference on Trade and Development (UNCTAD)

**Other Entities and Bodies**
Acronyms	Agency	Headquarters	Head	Established	Comment
UNHCR	United Nations High Commissioner for Refugees	Geneva, Switzerland	Filippo Grandi	1951
UNIFEM	United Nations Development Fund for Women	New York City, United States	Inés Alberdi	1976	Merged with UN Women in 2011
UN WOMEN	United Nations Entity for Gender Equality and the Empowerment of Women	New York City, United States	Phumzile Mlambo-Ngcuka	2010	Created by the merger of the Division for the Advancement of Women (DAW), the International Research and Training Institute for the Advancement of Women (INSTRAW), the Office of the Special Adviser on Gender Issues and Advancement of Women (OSAGI) and the United Nations Development Fund for Women (UNIFEM)
UNRWA	United Nations Relief and Works Agency for Palestine Refugees in the Near East	Gaza, Palestine and Amman, Jordan	Philippe Lazzarini	1949

Specialized agencies

The specialized agencies are autonomous organizations working with the United Nations and each other through the co-ordinating machinery of the Economic and Social Council and the Chief Executives Board for Coordination. Each was integrated into the UN System by way of an agreement with the UN under UN Charter article 57 (except ICSID and MIGA, both part of the World Bank Group).^[8]^[13]

Food and Agriculture Organization (FAO)
International Civil Aviation Organization (ICAO)
International Fund for Agricultural Development (IFAD)
International Labour Organization (ILO)
International Maritime Organization (IMO)
International Monetary Fund (IMF)
International Telecommunication Union (ITU)
United Nations Educational, Scientific and Cultural Organization (UNESCO)
United Nations Industrial Development Organization (UNIDO)
Universal Postal Union (UPU)
World Bank Group (WBG)
- International Bank for Reconstruction and Development (IBRD)
- International Centre for Settlement of Investment Disputes (ICSID)
- International Development Association (IDA)
- International Finance Corporation (IFC)
- Multilateral Investment Guarantee Agency (MIGA)
World Health Organization (WHO)
World Intellectual Property Organization (WIPO)
World Meteorological Organization (WMO)
World Tourism Organization (UNWTO)
International Refugee Organization (IRO); ceased to exist in 1952

Related organizations

Some organizations have a relationship with the UN defined by an arrangement different from the agreements between the specialized agencies and the UN, which are established under Articles 57 and 63 of the United Nations Charter.^[14]^[15]^[16]

International Organization for Migration (IOM)

The IOM, established in 1951, is the leading inter-governmental organization in the field of migration and works closely with governmental, intergovernmental and non-governmental partners. IOM works to help ensure the orderly and humane management of migration, to promote international cooperation on migration issues, to assist in the search for practical solutions to migration problems and to provide humanitarian assistance to migrants in need, including refugees and internally displaced people. In September 2016, IOM joined the United Nations System as a related organization during the United Nations General Assembly high-level summit to address large movements of refugees and migrants.^[17]

Comprehensive Nuclear-Test-Ban Treaty Organization Preparatory Commission (CTBTO PrepCom)

The CTBTO PrepCom reports to the UN General Assembly.^[16]

International Atomic Energy Agency (IAEA)

The relationship between the IAEA and the UN was established by a resolution of the UN General Assembly. Unlike the specialized agencies which report to ECOSOC, the IAEA reports to the General Assembly as well as the Security Council.^[8] Like the other specialized agency's heads, their executives are part of the United Nations System Chief Executives' Board for Coordination (CEB).^[8]

Organisation for the Prohibition of Chemical Weapons (OPCW)

The OPCW is not an agency of the United Nations, but cooperates both on policy and practical issues. On 7 September 2000 the OPCW and the UN signed a co-operation agreement outlining how they were to co-ordinate their activities.^[18] Under this agreement, the OPCW reports to the UN General Assembly.^[16]

World Trade Organization (WTO)

The WTO does not have a formal agreement with the UN. Instead, their relationship is governed by exchanges of letters. Unlike the specialized agencies and the IAEA, the WTO has no reporting obligations towards any of the principal organs of the UN, but provides ad hoc contribution to the work of the General Assembly and ECOSOC.^[16] The WTO has a seat on the CEB.^[8]

Chief Executives Board and Senior Management Group

The United Nations Chief Executives' Board for Coordination (CEB) brings together on a regular basis the executive heads of the organizations of the United Nations System, under the chairmanship of the secretary-general of the UN. The CEB aims to further co-ordination and co-operation on a whole range of substantive and management issues facing UN System organizations. In addition to its regular reviews of contemporary political issues and major concerns facing the UN System, the CEB approves policy statements on behalf of the UN System as a whole. Three committees report to the CEB, namely the High-level Committee on Programme (HCLP), the High-level Committee on Management (HCLM) and the United Nations Development Group (UNDG). Each of those bodies has, in turn, developed a subsidiary machinery of regular and ad hoc bodies on the substantive and managerial aspects of inter-agency co-ordination. The committee structure is supported by a CEB secretariat located in New York and Geneva.^[19]

There is also a Senior Management Group, composed of some of the senior officials in the secretariat and the funds and programmes at the Under-Secretary-General and Assistant Secretary-General rank, which serves as the cabinet of the Secretary-General.^[20]

United Nations common system

The United Nations, its subsidiary bodies, thirteen of the specialized agencies (ILO, FAO, UNESCO, WHO, ICAO, UPU, ITU, WMO, IMO, WIPO, IFAD, UNIDO, and UNWTO), and one related body (IAEA) are part of the United Nations common system of salaries, allowances, and benefits administered by the International Civil Service Commission. Most, but not all, of the members of the United Nations System are part of the common system; the Bretton Woods institutions (i.e. the World Bank Group and the IMF) are notable exceptions. The WTO utilizes the OECD common system. The UN common system was established to prevent competition amongst organizations of the United Nations System for staff and to facilitate co-operation and exchange between organizations.^[21]

Some international organizations that are not part of the United Nations System (and therefore not members of the common system) but who voluntarily follow the policies of the common system in whole or in part include:

Organization for Security and Co-operation in Europe (OSCE)^[22]
Organization of American States (OAS)^[23]

References

^ "Who We Are". UN System Chief Executives Board for Coordination. Archived from the original on 6 February 2020. Retrieved 28 January 2018.
^ "Directory of United Nations System Organizations". United Nations System Chief Executives Board for Coordination. Archived from the original on 17 September 2019. Retrieved 27 January 2018.
^ "United Nations System - Agreements with the UN system organizations". UNESCO. 19 September 2007. Archived from the original on 23 February 2014. Retrieved 11 August 2013.
^ ^a ^b "Structure and Organization". United Nations. Archived from the original on 9 March 2013. Retrieved 22 January 2013.
^ "NGLS Handbook - Introduction". United Nations Non-Governmental Liaison Service. Archived from the original on 13 May 2013. Retrieved 28 January 2013. The World Trade Organization (WTO) is not officially a part of the UN system ...
^ "UN System of Organizations". United Nations Global Marketplace. Archived from the original on 12 March 2013. Retrieved 28 January 2013. ... the World Trade Organization, which is not part of the UN system.
^ "How to do business with the United Nations" (PDF). Polish Ministry of Foreign Affairs. 2003. Archived from the original (PDF) on 22 February 2014. Retrieved 28 January 2013. ... the World Trade Organization, which is not part of the UN system.
^ ^a ^b ^c ^d ^e "The UN System, Chief Executives Board for Coordination". Unsceb.org. Retrieved 22 January 2013.^{[permanent dead link‍]}
^ "United Nations Charter, Chapter III: Organs". United Nations. Retrieved 6 March 2023.
^ CHARTER OF THE UNITED NATIONS: Chapter IV Archived 12 October 2007 at the Wayback Machine. UN.org.
^ "UN General Assembly". www.un.org. Archived from the original on 30 March 2018. Retrieved 6 April 2018.
^ "Background Information". UN Economic and Social Council. Archived from the original on 31 October 2013. Retrieved 29 June 2017.
^ 2020 Report of the Secretary-General on the Work of the Organization (Report). United Nations. 2020. p. 148.
^ United Nations System of Organizations Archived 31 December 2011 at the Wayback Machine: "Entries listed in bold are members of the United Nations System's Chief Executives Board".
^ "Specialized Agency Agreements | United Nations System Chief Executives Board for Coordination". www.unsystem.org. Archived from the original on 23 September 2020. Retrieved 23 September 2020.
^ ^a ^b ^c ^d "The United Nations System" (PDF). The United Nations. Archived (PDF) from the original on 14 February 2019.
^ "UN Summit for Refugees and Migrants 2016". Refugees and Migrants. 12 December 2014. Archived from the original on 1 August 2021. Retrieved 22 March 2021.
^ United Nations General Assembly Session 55 Resolution A/RES/55/283
^ "Chief Executives Board". Unsceb.org. 31 December 2007. Archived from the original on 28 March 2013. Retrieved 22 January 2013.
^ [1] Archived 15 November 2007 at the Wayback Machine
^ "Welcome to the International Civil Service Commission". Icsc.un.org. Archived from the original on 5 December 2011. Retrieved 22 January 2013.
^ OSCE General conditions of employment http://www.osce.org/employment/18 Archived 26 October 2011 at the Wayback Machine
^ Article 40 of the General Standards to govern the operations of the General Secretariat