Signatories to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT)

As of October 2013, 189 recognized states are party to the Nuclear Non-Proliferation Treaty (NPT). Montenegro was the most recent signatory from June 2006. North Korea withdrew its signature in January 2003. Three countries - India, Israel, & Pakistan - have never signed.

Country	Date of Signature	Date of Ratification	Method

Afghanistan	July 1, 1968	February 4, 1970	Ratification
Albania		September 12, 1990	Accession
Algeria		January 12, 1995	Accession
Andorra		June 7, 1996	Accession
Antigua and Barbuda		June 17, 1985	Succession (from UK)
Angola		October 15, 1996	Accession
Argentina		February 10, 1995	Accession
Armenia		June 21, 1993	Accession
Australia	February 27, 1970	January 23, 1973	Ratification
Austria	July 1, 1968	June 27, 1969	Ratification
Azerbaijan		September 22, 1992	Accession
Bahamas		August 11, 1976	Succession (from UK)
Bahrain		November 3, 1988	Accession
Bangladesh		August 31, 1979	Accession
Barbados	July 1, 1968	February 21, 1980	Ratification
Belarus		February 9, 1993	Accession
Belgium	August 20, 1968	May 2, 1975	Ratification
Belize		August 9, 1985	Succession (from UK)
Benin	July 1, 1968	October 31, 1972	Ratification
Bhutan		May 23, 1985	Accession
Bolivia	July 1, 1968	May 26, 1970	Ratification
Bosnia & Herzegovina		August 15, 1994	Succession (from Yugoslavia)
Botswana	July 1, 1968	April 28, 1969	Ratification
Brazil		September 18, 1998	Accession
Brunei		March 26, 1985	Accession
Bulgaria	July 1, 1968	September 5, 1969	Ratification
Burkina Faso	November 25, 1968	March 3, 1970	Ratification
Burundi		March 19, 1971	Accession
Cambodia		June 2, 1972	Accession
Cameroon	July 17, 1968	January 8, 1969	Ratification
Canada	July 23, 1968	January 8, 1969	Ratification
Cape Verde		October 24, 1979	Accession
Central African Republic		October 25, 1970	Accession
Chad	July 1, 1968	March 10, 1971	Ratification
Chile		May 25, 1995	Accession
China		March 9, 1992	Accession
Colombia	July 1, 1968	April 8, 1986	Ratification
Comoros		October 4, 1995	Accession
Congo		October 23, 1978	Accession
Costa Rica	July 1, 1968	March 3, 1970	Ratification
Cote d'Ivoire	July 1, 1968	March 6, 1973	Ratification
Croatia		June 29, 1992	Succession (from Yugoslavia)
Cyprus	July 1, 1968	February 10, 1970	Ratification
Czech Republic		January 1, 1993	Succession (from Czechoslovakia)
Democratic Republic of Congo	July 22, 1968	August 4, 1970	Ratification (as Zaire)
Denmark	July 1, 1968	January 3, 1969	Ratification
Djibouti		October 16, 1996	Accession
Dominica		August 10, 1984	Succession (from UK)
Dominican Republic	July 1, 1968	July 24, 1971	Ratification
Ecuador	July 9, 1968	March 7, 1969	Ratification
Egypt	July 1, 1968	February 26, 1981	Ratification
El Salvador	July 1, 1968	July 11, 1972	Ratification
Equatorial Guinea		November 1, 1984	Accession
Eritrea		March 16, 1995	Accession
Estonia		January 7, 1992	Accession
Ethiopia	September 5, 1968	February 5, 1970	Ratification
Fiji		July 21, 1972	Succession (from UK)
Finland	July 1, 1968	February 5, 1969	Ratification
France		August 2, 1992	Accession
Gabon		February 19, 1974	Accession
The Gambia	September 4, 1968	May 12, 1975	Ratification
Georgia		March 7, 1994	Accession
Germany	November 28, 1969	May 2, 1975	Ratification (as West Germany)
Ghana	July 1, 1968	May 4, 1970	Ratification
Greece	July 1, 1968	March 11, 1970	Ratification
Grenada		September 2, 1975	Succession (from UK)
Guatemala	July 26, 1968	September 22, 1970	Ratification
Guinea		April 29, 1985	Accession
Guinea-Bissau		August 20, 1976	Accension
Guyana		October 19, 1993	Accession
Haiti	July 1, 1968	June 2, 1970	Ratification
Holy See		February 25, 1971	Accession
Honduras	July 1, 1968	May 16, 1973	Ratification
Hungary	July 1, 1968	May 27, 1969	Ratification
Iceland	July 1, 1968	May 18, 1969	Ratification
Indonesia	March 2, 1970	July 12, 1979	Ratification
Iran	July 1, 1968	February 2, 1970	Ratification
Iraq	July 1, 1968	October 29, 1969	Ratification
Ireland	July 1, 1968	July 1, 1968	Ratification
Italy	January 28, 1969	May 2, 1975	Ratification
Jamaica	April 14, 1969	March 5, 1970	Ratification
Japan	February 3, 1970	June 8, 1976	Ratification
Jordan	July 10, 1968	February 11, 1970	Ratification
Kazakhstan		February 14, 1994	Accession
Kenya	July 1, 1968	June 11, 1970	Ratification
Kiribati		April 18, 1985	Succession (from UK)
Korea, South	July 1, 1968	April 23, 1975	Ratification
Kuwait	August 15, 1968	November 17, 1989	Ratification
Kyrgyzstan		July 5, 1994	Accession
Laos	July 1, 1968	February 20, 1970	Ratification
Latvia		January 31, 1992	Accession
Lebanon	July 1, 1968	July 15, 1970	Ratification
Lesotho	July 1, 1968	May 20, 1970	Ratification
Liberia	July 1, 1968	March 5, 1970	Ratification
Libya	July 18, 1968	May 26, 1975	Ratification
Liechtenstein		April 20, 1978	Accession
Lithuania		September 23, 1991	Accession
Luxembourg	August 14, 1968	May 2, 1975	Ratification
Macedonia		March 30, 1995	Succession (from Yugoslavia)
Madagascar	August 22, 1968	October 8, 1970	Ratification
Malawi		February 18, 1986	Accession
Malaysia	July 1, 1968	March 5, 1970	Ratification
Maldive Islands	September 11, 1968	April 7, 1970	Ratification
Mali	July 14, 1969	February 10, 1970	Ratification
Malta	April 17, 1969	February 6, 1970	Ratification
Marshall Islands		January 30, 1995	Accession
Mauritania		October 26, 1993	Accession
Mauritius	July 1, 1968	April 8, 1969	Ratification
Mexico	July 26, 1968	January 21, 1969	Ratification
Micronesia		April 14, 1995	Accession
Moldova		October 11, 1994	Accession
Monaco		March 13, 1995	Accession
Mongolia	July 1, 1968	May 15, 1969	Ratification
Montenegro		June 3, 2006	Accension
Morocco	July 1, 1968	November 27, 1970	Ratification
Mozambique		September 4, 1990	Accession
Myanmar		December 2, 1992	Accession
Namibia		October 2, 1992	Accession
Nauru		June 7, 1982	Accession
Nepal	July 1, 1968	January 5, 1970	Ratification
Netherlands	August 20, 1968	May 2, 1975	Ratification
New Zealand	July 1, 1968	September 10, 1969	Ratification
Nicaragua	July 1, 1968	March 6, 1973	Ratification
Niger		October 9, 1992	Accession
Nigeria	July 1, 1968	September 27, 1968	Ratification
Norway	July 1, 1968	February 5, 1969	Ratification
Oman		January 23, 1997	Accession
Palau		April 14, 1995	Accession
Panama	July 1, 1968	January 13, 1977	Ratification
Papua New Guinea		January 13, 1982	Accession
Paraguay	July 1, 1968	February 4, 1970	Ratification
Peru	July 1, 1968	March 3, 1970	Ratification
Philippines	July 1, 1968	October 5, 1972	Ratification
Poland	July 1, 1968	June 12, 1969	Ratification
Portugal		December 15, 1977	Accession
Qatar		April 3, 1989	Accession
Romania	July 1, 1968	February 4, 1970	Ratification
Russia	July 1, 1968	March 5, 1970	Ratification (as USSR)
Rwanda		May 20, 1975	Accession
St. Kitts and Nevis		November 6, 1984	Succession (from UK)
St. Lucia		December 28, 1979	Succession (from UK)
St. Vincent & Grenadines		November 6, 1984	Succession (from UK)
San Marino	July 1, 1968	August 10, 1970	Ratification
Sao Tome & Principe		July 20, 1983	Accession
Saudi Arabia		October 3, 1988	Accession
Senegal	July 1, 1968	December 17, 1970	Ratification
Serbia		January 1, 1993	Succession (from Yugoslavia)
Seychelles		March 12, 1985	Accession
Sierra Leone		February 26, 1975	Accession
Singapore	February 5, 1970	March 10, 1976	Ratification
Slovakia		January 1, 1993	Succession (from Czechoslovakia)
Slovenia		April 7, 1992	Succession (from Yugoslavia)
Solomon Islands		June 17, 1981	Succession (from UK)
Somalia	July 1, 1968	March 5, 1970	Ratification
South Africa		July 10, 1991	Accession
Spain		November 5, 1987	Accession
Sri Lanka	July 1, 1968	March 5, 1979	Ratification
Sudan	December 24, 1968	October 31, 1973	Ratification
Suriname		June 30, 1976	Succession (from Netherlands)
Swaziland	June 24, 1969	December 11, 1969	Ratification
Sweden	August 19, 1968	January 9, 1970	Ratification
Switzerland	November 27, 1969	March 9, 1977	Ratification
Syrian Arab Republic	July 1, 1968	September 24, 1969	Ratification
Taiwan	July 1, 1968	January 27, 1970	Ratification
Tajikistan		January 17, 1994	Accession
Tanzania		May 31, 1991	Accession
Thailand		December 7, 1972	Accession
Togo	July 1, 1968	February 26, 1970	Ratification
Tonga		July 7, 1971	Succession (from UK)
Trinidad & Tobago	August 20, 1968	October 30, 1968	Ratification
Tunisia	July 1, 1968	February 26, 1970	Ratification
Turkey	January 28, 1969	April 17, 1980	Ratification
Tuvalu		January 19, 1979	Succession (from UK)
Turkmenistan		September 29, 1994	Accession
Uganda		October 20, 1982	Accession
Ukraine		December 5, 1994	Accession
United Arab Emirates		September 26, 1995	Accession
United Kingdom	July 1, 1968	November 27, 1968	Ratification
United States	July 1, 1968	March 5, 1970	Ratification
Uruguay	July 1, 1968	August 31, 1970	Ratification
Uzbekistan		May 7, 1992	Accession
Vanuatu		August 24, 1995	Accession
Venezuela	July 1, 1968	September 25, 1975	Ratification
Vietnam		June 14, 1982	Accession
Yemen	November 14, 1968	June 1, 1979	Ratification (as North Yemen)
Zambia		May 15, 1991	Accession
Zimbabwe		September 26, 1991	Accession

Sources: Federation of American Scientists