List of parties to the Partial Test Ban Treaty

The list of parties to the Partial Test Ban Treaty encompasses the states who have signed and ratified or acceded to the international agreement prohibiting all test detonations of nuclear weapons except underground.

On August 5, 1963, the Partial Test Ban Treaty (PTBT) was opened for signature. The principal state authors (the Soviet Union, the United Kingdom, and the United States) signed the treaty that day. The PTBT came into force and closed for signature on October 10, 1963 with the ratification by the three principal states. Since then, states that did not sign the treaty can now only accede or succeed to it.

As of July 2008, 123 active states have ratified or acceded to the treaty, most recently Bosnia and Herzegovina on August 15, 1994. A further 10 states have signed but not ratified the treaty. The instrument of ratification, accession, or succession is deposited at the respective capitals of the principal states of the treaty: Moscow, London, and Washington, D.C..

Ratified or acceded states

Multiple dates indicate the different days in which states submitted their signature or deposition, varied by location. Where known, that location is noted by: (L) for London, (M) for Moscow, and (W) for Washington D.C.

State	Signed	Deposited	Method
Afghanistan	01963-08-08 August 8, 1963 (L, W) 01963-08-09 August 9, 1963 (M)	01964-03-12 March 12, 1964 (L) 01964-03-13 March 13, 1964 (W) 01964-03-23 March 23, 1964 (M)	Ratification
Antigua and Barbuda		01988-11-16 November 16, 1988 (M) 01988-12-26 December 26, 1988 (W) 01989-01-26 January 26, 1989 (L)^[1]	Succession from United Kingdom
Argentina	01963-08-08 August 8, 1963 (W) 01963-08-09 August 9, 1963 (M, L)	01986-11-14 November 14, 1986 (L) 01986-11-17 November 17, 1986 (M) 01986-11-21 November 21, 1986 (W)	Ratification^[2]
Armenia		01994-06-07 June 7, 1994 (M, W)	Accession
Australia	01963-08-08 August 8, 1963 (M, L, W)	01963-11-12 November 12, 1963 (M, L, W)	Ratification
Austria	01963-09-11 September 11, 1963 (M, L, W)	01964-07-17 July 17, 1964 (M, L, W)	Ratification
Bahamas		01976-07-16 July 16, 1976 (M) 01976-08-11 August 11, 1976 (L) 01976-08-13 August 13, 1976 (W)	Succession from United Kingdom
Bangladesh		01985-03-11 March 11, 1985 (M) 01985-03-12 March 12, 1985 (W) 01985-03-13 March 13, 1985 (L)	Accession
Belarus	01963-10-08 October 8, 1963 (M)	01963-12-16 December 16, 1963 (M)	Ratification as Byelorussian SSR
Belgium	01963-08-08 August 8, 1963 (M, L, W)	01966-03-01 March 1, 1966 (M, L, W)	Ratification
Benin	01963-08-27 August 27, 1963 (W) 01963-09-03 September 3, 1963 (L) 01963-10-09 October 9, 1963 (M)	01964-12-15 December 15, 1964 (W) 01964-12-23 December 23, 1964 (M) 01965-04-22 April 22, 1965 (L)	Ratification
Bhutan		01978-06-08 June 8, 1978 (W)	Accession
Bolivia	01963-08-08 August 8, 1963 (W) 01963-08-21 August 21, 1963 (L) 01963-09-20 September 20, 1963 (M)	01965-08-04 August 4, 1965 (M, W) 01966-01-25 January 25, 1966 (L)	Ratification
Bosnia and Herzegovina		01994-08-15 August 15, 1994 (W)	Succession from Yugoslavia
Botswana		01968-01-05 January 5, 1968 (M) 01968-02-14 February 14, 1968 (L) 01968-03-04 March 4, 1968 (W)	Succession from United Kingdom
Brazil	01963-08-08 August 8, 1963 (L, W) 01963-08-09 August 9, 1963 (M)	01964-12-15 December 15, 1964 (M) 01965-01-15 January 15, 1965 (W) 01965-03-04 March 4, 1965 (L)	Ratification
Bulgaria	01963-08-08 August 8, 1963	01963-11-13 November 13, 1963 01963-11-21 November 21, 1963 01963-12-02 December 2, 1963	Ratification
Burma	01963-08-14 August 14, 1963	01963-11-15 November 15, 1963	Ratification
Canada	01963-08-08 August 8, 1963	01964-01-28 January 28, 1964	Ratification
Cape Verde		01979-10-24 October 24, 1979	Accession
Central African Republic		01964-12-22 December 22, 1964 01965-08-24 August 24, 1965 01965-09-25 September 25, 1965	Accession
Chad	01963-08-26 August 26, 1963	01965-03-01 March 1, 1965	Ratification
Chile	01963-08-08 August 8, 1963 01963-08-09 August 9, 1963	01965-10-06 October 6, 1965	Ratification
Colombia	01963-08-16 August 16, 1963 01963-08-20 August 20, 1963	01985-10-17 October 17, 1985	Ratification
Costa Rica	01963-08-09 August 9, 1963 01963-08-13 August 13, 1963 01963-08-23 August 23, 1963	01967-07-10 July 10, 1967	Ratification
Côte d'Ivoire	01963-09-05 September 5, 1963	01965-07-05 July 5, 1965?^[3]	Ratification
Croatia		01991-10-08 October 8, 1991	Accession?^[4]
Cyprus	01963-08-08 August 8, 1963	01965-04-15 April 15, 1965 01965-04-21 April 21, 1965 01965-05-07 May 7, 1965	Ratification
Czech Republic		01993-01-01 January 1, 1993 01993-04-05 April 5, 1993 01993-04-09 April 9, 1993	Succession from Czechoslovakia Signed 01963-08-08 August 8, 1963 Ratified 01963-10-14 October 14, 1963
Democratic Republic of the Congo	01963-08-09 August 9, 1963?^[3] 01963-08-12 August 12, 1963	01965-10-28 October 28, 1965?^[3]	Ratification as Zaire
Denmark	01963-08-09 August 9, 1963	01964-01-15 January 15, 1964	Ratification
Dominican Republic	01963-09-16 September 16, 1963 01963-09-17 September 17, 1963 01963-09-19 September 19, 1963	01964-06-03 June 3, 1964 01964-06-18 June 18, 1964 01964-07-22 July 22, 1964	Ratification
Ecuador	01963-09-27 September 27, 1963 01963-10-01 October 1, 1963	01964-05-06 May 6, 1964 01964-05-08 May 8, 1964 01964-11-13 November 13, 1964	Ratification
Egypt	01963-08-08 August 8, 1963	01964-01-10 January 10, 1964	Ratification
El Salvador	01963-08-21 August 21, 1963 01963-08-22 August 22, 1963 01963-08-23 August 23, 1963	01964-12-03 December 3, 1964 01964-12-07 December 7, 1964 01965-02-09 February 9, 1965	Ratification
Equatorial Guinea		01989-01-16 January 16, 1989	Accession
Fiji		01972-07-18 July 18, 1972 01972-08-14 August 14, 1972	Succession from United Kingdom
Finland	01963-08-08 August 8, 1963	01964-01-09 January 9, 1964	Ratification
Gabon	01963-09-10 September 10, 1963 (W)	01964-02-20 February 20, 1964 (W) 01964-03-04 March 4, 1964 (L) 01964-03-09 March 9, 1964 (M)	Ratification
Gambia		01965-04-27 April 27, 1965 01965-05-06 May 6, 1965	Succession from United Kingdom
Germany	01963-08-19 August 19, 1963	01964-12-01 December 1, 1964	Ratification as West Germany Also East Germany Signed 01963-08-08 August 8, 1963 Ratified 01963-12-30 December 30, 1963
Ghana	01963-08-08 August 8, 1963 01963-08-09 August 9, 1963 01963-09-04 September 4, 1963	01963-11-27 November 27, 1963 01964-01-09 January 9, 1964 01965-05-31 May 31, 1965	Ratification
Greece	01963-08-08 August 8, 1963 01963-08-09 August 9, 1963	01963-12-18 December 18, 1963	Ratification
Guatemala	01963-09-23 September 23, 1963	01964-01-06 January 6, 1964	Ratification
Guinea-Bissau		01976-08-20 August 20, 1976	Accession
Honduras	01963-08-08 August 8, 1963 01963-08-15 August 15, 1963 01963-08-16 August 16, 1963	01964-10-02 October 2, 1964 01964-12-02 December 2, 1964	Ratification
Hungary	01963-08-08 August 8, 1963	01963-10-21 October 21, 1963 01963-10-22 October 22, 1963 01963-10-23 October 23, 1963	Ratification
Iceland	01963-08-12 August 12, 1963	01964-04-29 April 29, 1964	Ratification
India	01963-08-08 August 8, 1963	01963-10-10 October 10, 1963 01963-10-14 October 14, 1963 01963-10-18 October 18, 1963	Ratification
Indonesia	01963-08-23 August 23, 1963	01964-01-20 January 20, 1964 01964-01-27 January 27, 1964 01964-05-08 May 8, 1964	Ratification
Iran	01963-08-08 August 8, 1963	01964-05-05 May 5, 1964	Ratification
Iraq	01963-08-13 August 13, 1963?^[3]	01964-11-30 November 30, 1964?^[3]	Ratification
Ireland	01963-08-08 August 8, 1963 01963-08-09 August 9, 1963	01963-12-18 December 18, 1963 01963-12-20 December 20, 1963	Ratification
Israel	01963-08-08 August 8, 1963	01964-01-15 January 15, 1964 01964-01-28 January 28, 1964	Ratification
Italy	01963-08-08 August 8, 1963	01964-12-10 December 10, 1964	Ratification
Jamaica	01963-08-13 August 13, 1963	01991-11-11 November 11, 1991 01991-11-22 November 22, 1991	Ratification^[2]
Japan	01963-08-14 August 14, 1963	01964-06-15 June 15, 1964	Ratification
Jordan	01963-08-12 August 12, 1963 01963-08-19 August 19, 1963	01964-05-29 May 29, 1964 01964-07-07 July 7, 1964 01964-07-10 July 10, 1964	Ratification
Kenya		01965-06-10 June 10, 1965 01965-06-11 June 11, 1965 01965-06-30 June 30, 1965	Accession
Kuwait	01963-08-20 August 20, 1963	01965-05-20 May 20, 1965 01965-05-21 May 21, 1965 01965-06-17 June 17, 1965	Ratification
Laos	01963-08-12 August 12, 1963	01965-02-10 February 10, 1965 01965-02-12 February 12, 1965 01965-04-07 April 7, 1965	Ratification
Lebanon	01963-08-12 August 12, 1963 01963-08-13 August 13, 1963	01965-05-14 May 14, 1965 01965-05-20 May 20, 1965 01965-06-04 June 4, 1965	Ratification
Liberia	01963-08-08 August 8, 1963 01963-08-16 August 16, 1963 01963-08-27 August 27, 1963	01964-05-19 May 19, 1964 01964-05-22 May 22, 1964 01964-06-16 June 16, 1964	Ratification
Libya	01963-08-09 August 9, 1963 01963-08-16 August 16, 1963	01968-07-15 July 15, 1968	Ratification
Luxembourg	01963-08-13 August 13, 1963 01963-09-03 September 3, 1963 01963-09-13 September 13, 1963	01965-02-10 February 10, 1965	Ratification
Madagascar	01963-09-23 September 23, 1963	01965-03-15 March 15, 1965	Ratification
Malawi		01964-11-26 November 26, 1964 01965-01-07 January 7, 1965	Succession from United Kingdom
Malaysia	01963-08-08 August 8, 1963 01963-08-12 August 12, 1963 01963-08-21 August 21, 1963	01964-07-15 July 15, 1964 01964-07-16 July 16, 1964	Ratification
Malta		01964-11-25 November 25, 1964 01964-12-01 December 1, 1964	Succession from United Kingdom
Mauritania	01963-09-13 September 13, 1963 01963-09-17 September 17, 1963 01963-10-08 October 8, 1963	01964-04-06 April 6, 1964 01964-04-15 April 15, 1964 01964-04-28 April 28, 1964	Ratification
Mauritius		01969-04-30 April 30, 1969 01969-05-12 May 12, 1969	Succession from United Kingdom
Mexico	01963-08-08 August 8, 1963	01963-12-27 December 27, 1963	Ratification
Mongolia	01963-08-08 August 8, 1963	01963-11-01 November 1, 1963 01963-11-07 November 7, 1963	Ratification
Morocco	01963-08-27 August 27, 1963 01963-08-30 August 30, 1963	01966-02-01 February 1, 1966 01966-02-18 February 18, 1966 01966-02-21 February 21, 1966	Ratification
Nepal	01963-08-26 August 26, 1963 01963-08-30 August 30, 1963	01964-10-07 October 7, 1964?^[5]	Ratification
Netherlands	01963-08-09 August 9, 1963	01964-09-14 September 14, 1964	Ratification
New Zealand	01963-08-08 August 8, 1963	01963-10-10 October 10, 1963 01963-10-16 October 16, 1963	Ratification
Nicaragua	01963-08-13 August 13, 1963 01963-08-16 August 16, 1963	01965-01-26 January 26, 1965	Ratification
Niger	01963-09-24 September 24, 1963	01964-07-03 July 3, 1964 01964-07-06 July 6, 1964 01964-07-09 July 9, 1964	Ratification
Nigeria	01963-08-30 August 30, 1963 01963-09-02 September 2, 1963 01963-09-04 September 4, 1963	01967-02-17 February 17, 1967 01967-02-25 February 25, 1967 01967-02-28 February 28, 1967	Ratification
Norway	01963-08-09 August 9, 1963	01963-11-21 November 21, 1963	Ratification
Pakistan	01963-08-14 August 14, 1963	01988-03-03 March 3, 1988	Ratification^[2]
Panama	01963-09-20 September 20, 1963	01966-02-24 February 24, 1966	Ratification
Papua New Guinea		01980-10-27 October 27, 1980 01980-11-13 November 13, 1980 01981-03-16 March 16, 1981	Succession from Australia
Peru	01963-08-23 August 23, 1963	01964-07-20 July 20, 1964 01964-08-04 August 4, 1964 01964-08-21 August 21, 1964	Ratification
Philippines	01963-08-08 August 8, 1963 01963-08-14 August 14, 1963	01965-11-10 November 10, 1965 01965-11-15 November 15, 1965 01966-02-08 February 8, 1966	Ratification
Poland	01963-08-08 August 8, 1963	01963-10-14 October 14, 1963	Ratification
Republic of China	01963-08-23 August 23, 1963	01964-05-18 May 18, 1964	Ratification
Romania	01963-08-08 August 8, 1963	01963-12-12 December 12, 1963	Ratification
Russia	01963-08-05 August 5, 1963	01963-10-10 October 10, 1963	Ratification as Soviet Union
Rwanda	01963-09-19 September 19, 1963	01963-10-22 October 22, 1963 01963-12-16 December 16, 1963 01963-12-27 December 27, 1963	Ratification
Samoa	01963-09-05 September 5, 1963	01965-01-15 January 15, 1965 (L) 01965-01-19 January 19, 1965 (W) 01965-02-08 February 8, 1965 (M)	Ratification
San Marino	01963-09-17 September 17, 1963 01963-09-20 September 20, 1963 01963-09-24 September 24, 1963	01964-07-03 July 3, 1964	Ratification
Senegal	01963-09-20 September 20, 1963 01963-09-23 September 23, 1963 01963-10-09 October 9, 1963	01964-05-06 May 6, 1964 01964-05-12 May 12, 1964 01964-06-02 June 2, 1964	Ratification
Serbia	01963-08-08 August 8, 1963	01964-01-15 January 15, 1964	Ratification as Yugoslavia
Seychelles		01985-03-12 March 12, 1985?^[6] 01985-03-14 March 14, 1985?^[6] 01985-04-08 April 8, 1985	Accession
Sierra Leone	01963-09-04 September 4, 1963 01963-09-09 September 9, 1963 01963-09-11 September 11, 1963	01964-02-21 February 21, 1964 01964-03-04 March 4, 1964 01964-04-29 April 29, 1964	Ratification
Singapore		01968-07-12 July 12, 1968 01968-07-23 July 23, 1968	Succession from Malaysia
Slovakia		01993-01-01 January 1, 1993 01993-05-17 May 17, 1993 01993-06-25 June 25, 1993	Succession from Czechoslovakia Signed 01963-08-08 August 8, 1963 Ratified 01963-10-14 October 14, 1963
Slovenia		01992-04-07 April 7, 1992 01992-08-20 August 20, 1992	Succession from Yugoslavia
South Africa		01963-10-10 October 10, 1963 01963-11-22 November 22, 1963	Accession
South Korea	01963-08-30 August 30, 1963	01964-07-24 July 24, 1964	Ratification
Spain	01963-08-13 August 13, 1963 01963-08-14 August 14, 1963	01964-08-17 August 17, 1964?^[3]	Ratification
Sri Lanka	01963-08-22 August 22, 1963 01963-08-23 August 23, 1963	01964-02-05 February 5, 1964 01964-02-12 February 12, 1964 01964-02-13 February 13, 1964	Ratification
Sudan	01963-08-09 August 9, 1963	01966-03-04 March 4, 1966 01966-03-28 March 28, 1966	Ratification
Suriname		01993-01-06 January 6, 1993 01993-04-09 April 9, 1993	Accession
Swaziland		01969-05-29 May 29, 1969 01969-06-03 June 3, 1969	Accession
Sweden	01963-08-12 August 12, 1963	01963-12-09 December 9, 1963	Ratification
Switzerland	01963-08-26 August 26, 1963	01964-08-16 August 16, 1964?^[3]	Ratification
Syria	01963-08-13 August 13, 1963	01964-06-01 June 1, 1964	Ratification
Tanzania	01963-09-16 September 16, 1963 01963-09-18 September 18, 1963 01963-09-20 September 20, 1963	01964-02-06 February 6, 1964	Ratification
Thailand	01963-08-08 August 8, 1963	01963-11-15 November 15, 1963 01963-11-21 November 21, 1963 01963-11-29 November 29, 1963	Ratification
Togo	01963-09-18 September 18, 1963	01964-12-07 December 7, 1964	Ratification
Tonga		01971-06-22 June 22, 1971 01971-07-07 July 7, 1971	Succession from United Kingdom
Trinidad and Tobago	01963-08-12 August 12, 1963 01963-08-13 August 13, 1963	01964-07-14 July 14, 1964 01964-07-16 July 16, 1964 01964-08-06 August 6, 1964	Ratification
Tunisia	01963-08-08 August 8, 1963 01963-08-12 August 12, 1963 01963-08-13 August 13, 1963	01965-05-26 May 26, 1965 01965-06-03 June 3, 1965	Ratification
Turkey	01963-08-09 August 9, 1963	01965-07-08 July 8, 1965	Ratification
Uganda	01963-08-29 August 29, 1963	01964-03-24 March 24, 1964 01964-04-02 April 2, 1964	Ratification
Ukraine	01963-10-08 October 8, 1963	01963-12-30 December 30, 1963	Ratification as Ukrainian SSR
United Kingdom	01963-08-05 August 5, 1963	01963-10-10 October 10, 1963	Ratification
United States	01963-08-05 August 5, 1963	01963-10-10 October 10, 1963	Ratification
Uruguay	01963-08-12 August 12, 1963 01963-09-27 September 27, 1963	01969-02-25 February 25, 1969?^[7]	Ratification
Venezuela	01963-08-16 August 16, 1963 01963-08-20 August 20, 1963	01965-02-22 February 22, 1965 01965-03-03 March 3, 1965 01965-03-29 March 29, 1965	Ratification
Yemen	01963-09-06 September 6, 1963	01979-06-01 June 1, 1979	Accession as South Yemen Also signed by North Yemen
Zambia		01965-01-11 January 11, 1965^[8] 01965-02-08 February 8, 1965	Succession from United Kingdom

States that have signed but not ratified

State	Signed
Algeria	01963-08-14 August 14, 1963 (L, W) 01963-08-19 August 19, 1963 (M)
Burkina Faso	01963-08-30 August 30, 1963
Burundi	01963-10-04 October 4, 1963
Cameroon	01963-08-27 August 27, 1963 01963-09-06 September 6, 1963
Ethiopia	01963-08-09 August 9, 1963
Haiti	01963-10-09 October 9, 1963
Mali	01963-08-23 August 23, 1963
Paraguay	01963-08-15 August 15, 1963 01963-08-21 August 21, 1963
Portugal	01963-10-09 October 9, 1963
Somalia	01963-08-19 August 19, 1963

References

Limited Test Ban Treaty at the U.S. Department of State
Partial Test ban Treaty at the United Nations

^ The United Nations Office for Disarmament Affairs (UNODA) website lists Antigua and Barbuda's effective date of deposit as 1 November 1981, the state's day of independence.
^ ^a ^b ^c In contrast to the UNODA, the U.S. Department of State website lists Argentina, Jamaica, and Pakistan as acceding states. This appears to be in error because although their ratification was comparatively late, these states did sign the treaty.
^ ^a ^b ^c ^d ^e ^f ^g In contrast to the UNODA, the U.S. Department of State website lists Côte d'Ivoire's ratification date as 5 February 1965, Zaire's signature date as 8 August 1963, Zaire's ratification date as 28 October 1963, Iraq's signature date as 8 August 1963, Iraq's ratification date as 5 May 1964, Spain's ratification date as 17 December 1964, and Switzerland's ratification date as 16 January 1964. In each case where the sources differ, it is not known which date is correct.
^ The UNODA website does not list Croatia as an acceding state, but it is assumed to be because of the late date and lack of signature.
^ In contrast to the U.S. Department of State, the UNODA website lists Nepal's ratification date as 7 October 1963. It is believed the UNODA is in error given that it would place ratification before the principal states.
^ ^a ^b In contrast to the U.S. Department of State, the UNODA website lists the Seychelles' accession date as 12 March 1963. It is believed the UNODA is in error given that it would place accession before the treaty was even opened. The UNODA website also lists the Seychelles' second accession date as 14 March 1963 but this has been corrected to 1985 for the reason above.
^ In contrast to the UNODA, the U.S. Department of State website lists Uruguay's ratification date as 25 February 1963. This is believed to be in error given that it would place ratification before the treaty was even opened.
^ The UNODA website lists Zambia's effective date of deposit as 1 November 1981 but this is believed to be in error, given the lateness of the date and the apparent typographical copy from Antigua and Barbuda. The actual effective date is likely 24 October 1964, the state's day of independence.