List of parties to the Treaty on the Prohibition of Nuclear Weapons

The list of parties to the Treaty on the Prohibition of Nuclear Weapons encompasses the states which have signed and ratified or acceded to the Treaty on the Prohibition of Nuclear Weapons, a multilateral treaty outlawing nuclear weapons.

On 20 September 2017, the treaty was opened for signature. Following Article 15 of the treaty, it entered into force on 22 January 2021 after it had been ratified by 50 states.Article 15, Treaty on the Prohibition of Nuclear Weapons. Wikisource. States have the option of acceding to the treaty without signing.

A total of 197 states may become parties to the Treaty on the Prohibition of Nuclear Weapons, including all 193 member states of the United Nations, the Holy See, the State of Palestine, the Cook Islands, and Niue. As of September 2026, 75 states have ratified or acceded to the treaty, most recently Tonga, and a further 26 states have signed but not ratified the treaty.

States Parties According to the treaties database maintained by the United Nations Office for Disarmament Affairs, as of July 2026, the TPNW has 75 parties: 70 states have ratified it, and another 5 have acceded to it.

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Signatory states As of September 2026, the following 26 states have signed but not ratified the TPNW. State Signed

See also List of parties to the Biological Weapons Convention List of parties to the Chemical Weapons Convention List of parties to the Convention on Certain Conventional Weapons List of parties to the Comprehensive Nuclear-Test-Ban Treaty List of parties to the Treaty on the Non-Proliferation of Nuclear Weapons List of parties to the Ottawa Treaty List of parties to the Partial Nuclear Test Ban Treaty List of parties to weapons of mass destruction treaties

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