List of United Nations organizations

The United Nations maintains and supports a number of specialized organizations and agencies. These differ from the programmes and funds in that they are headed by an executive board of member states, separate from the General Assembly. Sometimes they do not report to the General Assembly or Security Council but only to their own member states. Some of these bodies also predate the United Nations as is the case for the ITU formed in 1865 to administer an international treaty and the ILO created as part of the League of Nations.

Specialized organisations and agencies of the United Nations

No.	Acronyms	Agency	Headquarters	Head	Established	Comment
1	FAO	Food and Agriculture Organization	Rome, Italy	Qu Dongyu	1946
2	IAEA	International Atomic Energy Agency	Vienna, Austria	Rafael Grossi	1957	Associated agency
3	ICAO	International Civil Aviation Organization	Montreal, Quebec, Canada	Fang Liu	1947
4	IFAD	International Fund for Agricultural Development	Rome, Italy	Gilbert F. Houngbo	1977
5	ILO	International Labour Organization	Geneva, Switzerland	Guy Ryder	1919	Originally part of League of Nations
6	IMO	International Maritime Organization	London, United Kingdom	Kitack Lim	1948
7	IMF	International Monetary Fund	Washington, D.C., United States	Kristalina Georgieva	1945
8	ITU	International Telecommunication Union	Geneva, Switzerland	Houlin Zhao	1865
9	UNESCO	United Nations Educational, Scientific and Cultural Organization	Paris, France	Audrey Azoulay	1945
10	UPU	Universal Postal Union	Bern, Switzerland	Bishar Abdirahman Hussein	1947
11	WBG	World Bank Group	Washington, D.C., United States	David Malpass	1945
12	WIPO	World Intellectual Property Organization	Geneva, Switzerland	Francis Gurry	1974
13	WMO	World Meteorological Organization	Geneva, Switzerland	David Grimes	1950
14	UNWTO	United Nations World Tourism Organization	Madrid, Spain	Zurab Pololikashvili	1974
15	UNODC	United Nations Office on Drugs and Crime	Vienna, Austria	Yuri Fedotov	1997
16	WHO	World Health Organization	Geneva, Switzerland	Tedros Adhanom	1948	to promote mental and physical health of humanity
17	UNHCR	Office of United Nations High Commissioner for Refugees	Geneva, Switzerland	Filippo Grandi	1950
18	WFP	Office of United Nations World Food Program	Rome, Italy	David Beasley	1961
19	UNIDO	United Nations Industrial Development Organization	Vienna, Austria	Li Yong	1966	Industrial development for poverty reduction, inclusive globalization and environmental sustainability

The United Nations Secretariat carries out the day-to-day work of the Organisation. It services the other principal organs of the United Nations and administers the programmes and policies laid down by them. At its head is the Secretary-General, who is appointed by the General Assembly. The Secretariat administers a number of notable Offices and Departments.

Departments and Offices of the United Nations Secretariat

No.	Acronyms	Agency	Headquarters	Head	Established	Comment
1	UNOCHA	Office for the Coordination of Humanitarian Affairs	New York City, United States	Stephen O'Brien	1991
2	UNOOSA	United Nations Office for Outer Space Affairs	Vienna, Austria	Simonetta Di Pippo	1958
3	UNODA	United Nations Office for Disarmament Affairs		Izumi Nakamitsu	1998

The United Nations maintains, administers or has a working relationship with a number of organisations dedicated to the administration of a variety of international treaties and conventions. At times these perform specific administrative functions while also providing a specific forum for discussing issues around a particular treaty. The organisations themselves generally report to the member states of the treaty rather than to the General Assembly.

Organizations with a working relationship with the United Nations

No.	Acronyms	Agency	Headquarters	Head	Established	Comment
1	ISA	International Seabed Authority	Kingston, Jamaica	Michael W Lodge	1994
2	CTBTO	Comprehensive Nuclear-Test-Ban Treaty Organization	Vienna, Austria	Lassina Zerbo	1997 (preparatory commission)	Provisional organisation
3	OPCW	Organisation for the Prohibition of Chemical Weapons	The Hague, Netherlands	Fernando Arias	1997	Related organisation

There are only five officially recognised training bodies of the United Nations System. Irrespective of what does or does not constitute a United Nations organization, many other institutions serve a research or training purpose, and some are part of other organisations and funds. These are also contained below.

Research and training bodies of the United Nations

No.	Acronyms	Agency	Headquarters	Head	Established	Comment
1	UNIDIR	United Nations Institute for Disarmament Research	Geneva, Switzerland	Renata Dwan	1980
2	UNU	United Nations University	Tokyo, Japan	David M. Malone	1969
3	UNITAR	United Nations Institute for Training and Research	Geneva, Switzerland	Nikhil Seth	1965
4	UNRISD	United Nations Research Institute For Social Development	Geneva, Switzerland	Paul Ladd	1963
5	UNICRI	United Nations Interregional Crime and Justice Research Institute	Turin, Italy	Bettina Tucci Bartsiotas	1968
6	UNSSC	United Nations System Staff College	Turin, Italy	Jafar Javan	2002
7	UPEACE	University for Peace	San José, Costa Rica	Francisco Rojas Aravena	1980	UN mandated
8	ICTP	International Centre for Theoretical Physics	Trieste, Italy	Fernando Quevedo	1964	IAEA, UNESCO, Italian Govt
9	IRC	Innocenti Research Centre - International Child Development Centre	Florence, Italy	Marie-Claude Martin	1988	Part of UNICEF

The following entities were established by the General Assembly.

Acronym	Agency	Headquarters	Head	Established	Comment
ICSC	Domestic Civil Service Commission	New York City, United States	John P. Hamilton	1975
ACPAQ	Advisory Committee on Post Adjustment Questions	New York City, United States	Wolfgang Stöckl		Part of ICSC

• United Nations System