Thailand has been a member of the United Nations since the sixteenth of December, 1946. Thailand has ratified a number of United Nations environmental, human rights and labour treaties and conventions and is a strong supporter of UN peacekeeping operations. Thailand is the regional hub for United Nations organizations and systems in Asia, with more than twenty eight regional offices of specialised UN agencies, Organizations and projects which include:

The Food and Agriculture Organization
The International Civil Aviation Organization
The International Finance Coroporation
The International Labour Organization for Thailand, Cambodia and Lao
The International Telecommunication Union
The Office for the Coordination of Humanitarian Affairs
UNAIDS Thailand
The United Nations Convention to Combat Desertification
The United Nations Development Program
The United Nations Environment Program
The United Nations Educational, Scientific and Cultural Organization
The United Nations Population Fund
The United Nations Human Settlements Program
The United Nations High Commissioner for Refugees – Thailand
The United Nations Childrens Fund East Asia and Pacific Regional Office
The United Nations Industrial Development Organization
The United Nations Offices on Drugs and Crime
The Universal Postal Union
The World Bank Group
The World Food Bank
The World Health Organization

The United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP) has its head office in Thailand along with the Asia Pacific regional centre for the UN Development Program (UNDP-APRC). In addition the Asian Development Bank (ADB) and the International Organization of Migration are also situated in Thailand, which are treated as part of the UNCT-Thailand even though they are partner organizations.