Nuclear Weapons Ban Treaty

Photo: Aude Catimel/ICAN

The International Humanitarian Movement for Nuclear Disarmament

The tides are turning. On July 7, 2017, the U.N. adopted the first-ever treaty imposing a comprehensive prohibition against nuclear weapons; more than 120 nations were in support. Inspired by past efforts that led to bans on land mines and cluster bombs, the treaty—negotiated without the nine nuclear-armed countries—reframes nuclear disarmament as a global health imperative and provides a vision for a nuclear weapons-free world.

The International Campaign to Abolish Nuclear Weapons (ICAN) mobilized civil society across more than 100 countries to create the political momentum at the U.N. to achieve the treaty. ICAN won the 2017 Nobel Peace Prize for raising awareness on the humanitarian impact of nuclear weapons. PSR’s global affiliate, International Physicians for the Prevention of Nuclear War (IPPNW), founded ICAN in 2007. PSR is a proud U.S.-partner of ICAN.

About the Nuclear Weapons Ban Treaty

On July 7, 2017, the U.N. adopted the Treaty on the Prohibition of Nuclear Weapons (TPNW), which comprehensively prohibits nuclear weapons and related activities. The medical community’s advocacy and research helped civil society and the international community devise public health solutions to the threat of nuclear weapons.

Ban Treaty at a Glance

September 2017

Quick guide to the Treaty on the Prohibition of Nuclear Weapons approved by the U.N. on July 7, 2017.

ICAN/Clare Conboy

Photo: Clare Conboy/ICAN

By The Numbers


nations have ratified the nuclear weapons ban treaty

Ban Treaty Signatories

The Treaty on the Prohibition of Nuclear Weapons entered into force on January 22, 2021 after Honduras ratified the treaty, becoming the 50th nation to do so.


nuclear states have ratified the nuclear weapons ban treaty

Nuclear-Armed Nations

Neither the U.S. nor any of the other 8 nuclear-armed states have supported the treaty. Activists in the U.S. are pushing for recognition.

Photo: Clare Conboy/ICAN

Latest Ban Treaty News & Actions

Tell the Biden Administration: It is time for the U.S. to engage with the Ban Treaty

Please send a message to the Biden Administration encouraging him to send an official delegation of observers to this important international meeting at the UN.

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Mombasa Appeal for peace and prevention of nuclear war

This statement was issued by IPPNW’s International Council and Board of Directors at the conclusion of the 23rd IPPNW World Congress in Mombasa, Kenya. PSR endorses the Mombasa Appeal and the PSR delegation to the World Congress fully supported its adoption.

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Ban Treaty makes progress, even swimming upstream 

Norwegian People’s Aid has released Nuclear Weapons Ban Monitor 2022, which tracks progress toward implementing the ban.

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Local activist wins Gandhi-King-Ikeda Award

The MLK Chapel at Morehouse College awarded PSR Past President Dr. Ira Helfand for his work on the Back from the Brink campaign.

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