World Health Organization Headquarters
World Health Organization, Avenue Appia 20, 1211 Geneva 27, Switzerland
Telephone: + 41 22 791 21 11
Facsimile (fax): + 41 22 791 31 11
The World Health Organization (WHO) is a specialized agency of the United Nations that is concerned with international public health. It was established on 7 April 1948, headquartered in Geneva, Switzerland. The WHO is a member of the United Nations Development Group. Its predecessor, the Health Organization, was an agency of the League of Nations.