The United Nations Charter established six principal bodies of the Organisation: the General Assembly, the United Nations Security Council, the Economic and Social Council, the Trusteeship Council (this Council suspended operations in 1994), the International Court of Justice, and the Secretariat.

The Charter allowed for the creation of any other entities that were seen as required. Since its creation the United Nations is now considerably larger, encompassing numerous specialised organisations and agencies, programmes and funds, training and research bodies as well as other service providers.

There are also numerous subsidiary bodies, including committees, commissions, boards, councils, panels, and working groups some of which this list includes.

No. Acronyms Organization Headquarters
1 FAO Food and Agricultural Organisation Rome, Italy
2 IAEA International Atomic Energy Agency Vienna, Austria
3 IBRD or World Bank International Bank For Reconstruction and Development Washington, USA
4 ICAO International Civil Aviation Organization Montreal, Canada
5 IFAD International Fund for Agricultural Development Rome, Italy
6 IFC International Finance Corporation Washington, USA
7 ILO International Labour Organization Geneva, Switzerland
8 IMCO Inter-governmental Maritime Consultative Organisation London, UK
9 IMF International Monetary Fund Washington, D.C.,USA
10 IMO International Maritime Organization London, United Kingdom
11 ITD International Telecommunication Union Geneva, Switzerland
12 ITU International Telecommunication Union Geneva, Switzerland
13 UND I O United Nations Data and Information Organization  Kampala, Uganda
14 UNDP United Nations Development Programme New york, USA
15 UNEP United Nations Environment Programme Nairobi, Kenya
16 UNESCO United Nations Educational, Scientific and Cultural Organization Paris, France
17 UNFPA United Nations Fund for Population Activities New york, USA
18 UNHCR United Nations High Commissioner for Refugees Geneva, Switzerland
19 UNICEF United Nations International Children’s Emergency Fund New york, USA
20 UNIDO United Nations Industrial Development Organizations Vienna, Austria
21 UNODC United Nations Office on Drugs and Crime Vienna, Austria
22 UNWTO World Tourism Organization Madrid, Spain
23 UPU Universal Postal Union Berne, Switzerland
24 WB World Bank Washington, D.C, USA
25 WHO World Health Organisation Geneva, Switzerland
26 WIPO World Intellectual Property Organization Geneva, Switzerland
27 WMO World Meteorological Organization Geneva, Switzerland