| Entry into force: | 7 April 1948, in accordance with article 80. |
| Registration: | 7 April 1948, No. 221. |
| Status: | Signatories: 60 ,Parties: 1896. |
| Text: | United Nations, Treaty Series, vol. 14, p. 185 (with regard to the text of subsequent amendments, see further under each series of amendments). |
Note: The Constitution was drawn up by the International Health Conference, which had been convened pursuant to resolution l (I)1 of the Economic and Social Council of the United Nations, adopted on 15 February 1946. The Conference was held at New York from 19 June to 22 July 1946. In addition to the Constitution, the Conference drew up the Final Act, the Arrangements for the Establishment of an Interim Commission of the World Health Organization and the Protocol concerning the Office international d'hygiène publique, for the text of which, see United Nations, Treaty Series, vol. 9, p. 3.
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| Participant2 | Signature | Definitive signature (s), Acceptance (A) |
| Afghanistan | 19 Apr 1948 A | |
| Albania | 22 Jul 1946 | 26 May 1947 A |
| Algeria | 8 Nov 1962 A | |
| Andorra | 15 Jan 1997 A | |
| Angola | 15 May 1976 A | |
| Antigua and Barbuda | 12 Mar 1984 A | |
| Argentina | 22 Jul 1946 | 22 Oct 1948 A |
| Armenia | 4 May 1992 A | |
| Australia | 22 Jul 1946 | 2 Feb 1948 A |
| Austria | 22 Jul 1946 | 30 Jun 1947 A |
| Azerbaijan | 2 Oct 1992 A | |
| Bahamas | 1 Apr 1974 A | |
| Bahrain | 2 Nov 1971 A | |
| Bangladesh | 19 May 1972 A | |
| Barbados | 25 Apr 1967 A | |
| Belarus | 22 Jul 1946 | 7 Apr 1948 A |
| Belgium | 22 Jul 1946 | 25 Jun 1948 A |
| Belize | 23 Aug 1990 A | |
| Benin | 20 Sep 1960 A | |
| Bhutan | 8 Mar 1982 A | |
| Bolivia | 22 Jul 1946 | 23 Dec 1949 A |
| Bosnia and Herzegovina | 10 Sep 1992 A | |
| Botswana | 26 Feb 1975 A | |
| Brazil | 22 Jul 1946 | 2 Jun 1948 A |
| Brunei Darussalam | 25 Mar 1985 A | |
| Bulgaria | 22 Jul 1946 | 9 Jun 1948 A |
| Burkina Faso | 4 Oct 1960 A | |
| Burundi | 22 Oct 1962 A | |
| Cambodia | 17 May 1950 A | |
| Cameroon | 6 May 1960 A | |
| Canada | 22 Jul 1946 | 29 Aug 1946 A |
| Cape Verde | 5 Jan 1976 A | |
| Central African Republic | 20 Sep 1960 A | |
| Chad | 1 Jan 1961 A | |
| Chile | 22 Jul 1946 | 15 Oct 1948 A |
| China2 | 22 Jul 1946 s | |
| Colombia | 22 Jul 1946 | 14 May 1959 A |
| Comoros | 9 Dec 1975 A | |
| Congo | 26 Oct 1960 A | |
| Cook Islands | 9 May 1984 A | |
| Costa Rica | 22 Jul 1946 | 17 Mar 1949 A |
| Côte d'Ivoire | 28 Oct 1960 A | |
| Croatia | 11 Jun 1992 A | |
| Cuba | 22 Jul 1946 | 9 May 1950 A |
| Cyprus | 16 Jan 1961 A | |
| Czech Republic3 | 22 Jan 1993 A | |
| Democratic People's Republic of Korea | 19 May 1973 A | |
| Democratic Republic of the Congo | 24 Feb 1961 A | |
| Denmark | 22 Jul 1946 | 19 Apr 1948 A |
| Djibouti | 10 Mar 1978 A | |
| Dominica | 13 Aug 1981 A | |
| Dominican Republic | 22 Jul 1946 | 21 Jun 1948 A |
| Ecuador | 22 Jul 1946 | 1 Mar 1949 A |
| Egypt | 22 Jul 1946 | 16 Dec 1947 A |
| El Salvador | 22 Jul 1946 | 22 Jun 1948 A |
| Equatorial Guinea | 5 May 1980 A | |
| Eritrea | 24 Jul 1993 A | |
| Ethiopia | 22 Jul 1946 | 11 Apr 1947 A |
| Fiji | 1 Jan 1972 A | |
| Finland | 22 Jul 1946 | 7 Oct 1947 A |
| France | 22 Jul 1946 | 16 Jun 1948 A |
| Gabon | 21 Nov 1960 A | |
| Gambia | 26 Apr 1971 A | |
| Georgia | 26 May 1992 A | |
| Germany4,5 | 29 May 1951 A | |
| Ghana | 8 Apr 1957 A | |
| Greece | 22 Jul 1946 | 12 Mar 1948 A |
| Grenada | 4 Dec 1974 A | |
| Guatemala | 22 Jul 1946 | 26 Aug 1949 A |
| Guinea | 19 May 1959 A | |
| Guinea-Bissau | 29 Jul 1974 A | |
| Guyana | 27 Sep 1966 A | |
| Haiti | 22 Jul 1946 | 12 Aug 1947 A |
| Honduras | 22 Jul 1946 | 8 Apr 1949 A |
| Hungary | 19 Feb 1947 | 17 Jun 1948 A |
| Iceland | 17 Jun 1948 A | |
| India | 22 Jul 1946 | 12 Jan 1948 A |
| Indonesia | 23 May 1950 A | |
| Iran (Islamic Republic of) | 22 Jul 1946 | 23 Nov 1946 A |
| Iraq | 22 Jul 1946 | 23 Sep 1947 A |
| Ireland | 22 Jul 1946 | 20 Oct 1947 A |
| Israel | 21 Jun 1949 A | |
| Italy | 22 Jul 1946 | 11 Apr 1947 A |
| Jamaica | 21 Mar 1963 A | |
| Japan | 16 May 1951 A | |
| Jordan | 22 Jul 1946 | 7 Apr 1947 A |
| Kazakhstan | 19 Aug 1992 A | |
| Kenya | 27 Jan 1964 A | |
| Kiribati | 26 Jul 1984 A | |
| Kuwait | 9 May 1960 A | |
| Kyrgyzstan | 29 Apr 1992 A | |
| Lao People's Democratic Republic | 17 May 1950 A | |
| Latvia | 4 Dec 1991 A | |
| Lebanon | 22 Jul 1946 | 19 Jan 1949 A |
| Lesotho | 7 Jul 1967 A | |
| Liberia | 22 Jul 1946 | 14 Mar 1947 A |
| Libyan Arab Jamahiriya | 16 May 1952 A | |
| Lithuania | 25 Nov 1991 A | |
| Luxembourg | 22 Jul 1946 | 3 Jun 1949 A |
| Madagascar | 16 Jan 1961 A | |
| Malawi | 9 Apr 1965 A | |
| Malaysia | 24 Apr 1958 A | |
| Maldives | 5 Nov 1965 A | |
| Mali | 17 Oct 1960 A | |
| Malta | 1 Feb 1965 A | |
| Marshall Islands | 5 Jun 1991 A | |
| Mauritania | 7 Mar 1961 A | |
| Mauritius | 9 Dec 1968 A | |
| Mexico | 22 Jul 1946 | 7 Apr 1948 A |
| Micronesia (Federated States of) | 14 Aug 1991 A | |
| Monaco | 8 Jul 1948 A | |
| Mongolia | 18 Apr 1962 A | |
| Morocco | 14 May 1956 A | |
| Mozambique | 11 Sep 1975 A | |
| Myanmar | 1 Jul 1948 A | |
| Namibia | 23 Apr 1990 A | |
| Nauru | 9 May 1994 A | |
| Nepal | 2 Sep 1953 A | |
| Netherlands | 22 Jul 1946 | 25 Apr 1947 A |
| New Zealand | 22 Jul 1946 | 10 Dec 1946 A |
| Nicaragua | 22 Jul 1946 | 24 Apr 1950 A |
| Niger | 5 Oct 1960 A | |
| Nigeria | 25 Nov 1960 A | |
| Niue | 5 May 1994 A | |
| Norway | 22 Jul 1946 | 18 Aug 1947 A |
| Oman | 28 May 1971 A | |
| Pakistan | 23 Jun 1948 A | |
| Palau | 9 Mar 1995 A | |
| Panama | 22 Jul 1946 | 20 Feb 1951 A |
| Papua New Guinea | 29 Apr 1976 A | |
| Paraguay | 22 Jul 1946 | 4 Jan 1949 A |
| Peru | 22 Jul 1946 | 11 Nov 1949 A |
| Philippines | 22 Jul 1946 | 9 Jul 1948 A |
| Poland | 22 Jul 1946 | 6 May 1948 A |
| Portugal | 22 Jul 1946 | 13 Feb 1948 A |
| Qatar | 11 May 1972 A | |
| Republic of Korea | 17 Aug 1949 A | |
| Republic of Moldova | 4 May 1992 A | |
| Romania | 8 Jun 1948 A | |
| Russian Federation | 22 Jul 1946 | 24 Mar 1948 A |
| Rwanda | 7 Nov 1962 A | |
| Saint Kitts and Nevis | 3 Dec 1984 A | |
| Saint Lucia | 11 Nov 1980 A | |
| Saint Vincent and the Grenadines | 1 Sep 1983 A | |
| Samoa | 16 May 1962 A | |
| San Marino | 12 May 1980 A | |
| Sao Tome and Principe | 23 Mar 1976 A | |
| Saudi Arabia | 22 Jul 1946 | 26 May 1947 A |
| Senegal | 31 Oct 1960 A | |
| Seychelles | 11 Sep 1979 A | |
| Sierra Leone | 20 Oct 1961 A | |
| Singapore | 25 Feb 1966 A | |
| Slovakia3 | 4 Feb 1993 A | |
| Slovenia | 7 May 1992 A | |
| Solomon Islands | 4 Apr 1983 A | |
| Somalia | 26 Jan 1961 A | |
| South Africa | 22 Jul 1946 | 7 Aug 1947 A |
| Spain | 28 May 1951 A | |
| Sri Lanka | 7 Jul 1948 A | |
| Sudan | 14 May 1956 A | |
| Suriname | 25 Mar 1976 A | |
| Swaziland | 16 Apr 1973 A | |
| Sweden | 13 Jan 1947 | 28 Aug 1947 A |
| Switzerland | 22 Jul 1946 | 26 Mar 1947 A |
| Syrian Arab Republic | 22 Jul 1946 | 18 Dec 1946 A |
| Tajikistan | 4 May 1992 A | |
| Thailand | 22 Jul 1946 | 26 Sep 1947 A |
| the former Yugoslav Republic of Macedonia | 22 Apr 1993 A | |
| Togo | 13 May 1960 A | |
| Tonga | 14 Aug 1975 A | |
| Trinidad and Tobago | 3 Jan 1963 A | |
| Tunisia | 14 May 1956 A | |
| Turkey | 22 Jul 1946 | 2 Jan 1948 A |
| Turkmenistan | 2 Jul 1992 A | |
| Tuvalu | 7 May 1993 A | |
| Uganda | 7 Mar 1963 A | |
| Ukraine | 22 Jul 1946 | 3 Apr 1948 A |
| United Arab Emirates | 30 Mar 1972 A | |
| United Kingdom of Great Britain and Northern Ireland | 22 Jul 1946 s | |
| United Republic of Tanzania6 | ||
| United States of America7 | 22 Jul 1946 | 21 Jun 1948 A |
| Uruguay | 22 Jul 1946 | 22 Apr 1949 A |
| Uzbekistan | 22 May 1992 A | |
| Vanuatu | 7 Mar 1983 A | |
| Venezuela | 22 Jul 1946 | 7 Jul 1948 A |
| Viet Nam8 | 17 May 1950 A | |
| Yemen9 | 6 May 1968 A | |
| Yugoslavia | 22 Jul 1946 | 19 Nov 1947 A |
| Zambia | 2 Feb 1965 s | |
| Zimbabwe | 16 May 1980 A |