Nuclear-weapon-free state

Voted in favour of adopting TPNW

Has not yet joined TPNW

Switzerland has not yet signed or ratified the Treaty on the Prohibition of Nuclear Weapons. It participated in the negotiation of the treaty at the United Nations in New York in 2017 and voted in favour of its adoption. However, following the vote, it indicated that it was not fully supportive of the treaty text as adopted.

In June 2018, the Swiss government published a report on the implications of becoming a state party, which concluded that, “[a]t this stage, the reasons against an accession of Switzerland outweigh the potential opportunities accompanying a signature and ratification of this treaty”.

Both houses of the Swiss parliament subsequently instructed the government to proceed with signature and ratification of the treaty without delay. The government responded by announcing in April 2019 that it would review its decision by the end of 2020.

Switzerland’s reluctance to date to join the treaty has prompted some commentators to question whether the government has abandoned its “humanitarian tradition” and become too closely aligned with the North Atlantic Treaty Organisation (NATO), a so-called “nuclear alliance”.

Switzerland abstained from voting on a UN General Assembly resolution in 2019 that welcomed the adoption of the treaty and called upon “all states that have not yet done so to sign, ratify, accept, approve, or accede to the treaty at the earliest possible date”.

In its opening statement to the negotiating conference, Switzerland said that it “stands ready to actively participate in this endeavour, and help elaborate an instrument that brings us closer to the shared goal of achieving a world without nuclear weapons”.

In 2016, Switzerland abstained from voting on the UN General Assembly resolution that established the formal mandate for states to commence the negotiations in 2017 on “a legally binding instrument to prohibit nuclear weapons, leading towards their total elimination”.

Prior to the adoption of the treaty in 2017, nuclear weapons were the only weapons of mass destruction not subject to a comprehensive, globally applicable treaty prohibition. Switzerland supported calls in the UN General Assembly fill this “legal gap”.

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Support for TPNW Get involved with ICAN in Switzerland›

ICAN Parliamentary Pledge

These are the Swiss elected representatives that support and promote the TPNW:

Isabelle Chevalley
Fabian Molina
Jacques-André Maire
Beat Flach
Martina Munz
Liliane Maury Pasquier
Carlo Sommaruga
Didier Berberat
Lisa Mazzone
Michael Töngi
Prisca Birrer-Heimo
Balthasar Glättli
Sibel Arslan
Brigitte Crottaz
Samuel Bendahan

ICAN Cities Appeal

These are the cities and towns in this country speaking out in support of the TPNW:

St Gallen

Find a local ICAN partner to get active Become an ICAN Partner Organization ›

  • Business and Rights Conform (BHCR)
  • ICAN Switzerland


  • KLAR! Schweiz 


  • Physicians for Social Responsibility (Switzerland)


  • Ärztinnen und Ärzte für Umweltschutz (AefU) 


  • Sortir du nucléaire Suisse Romande


  • World Federation of Public Health Associations


  • Friedenskraft.ch