List of Countries which Signed Treaty on the Prohibition of Nuclear Weaponon Opening Day, 20 September 2017

On 20 September 2017, the Treaty on the Prohibition of Nuclear Weapons opened for signature at the United Nations headquarters in New York. As of 20 September, fifty (50) States have signed the treaty, with three (3) States also depositing their instruments of ratification with the Office of Legal Affairs.

The Treaty will remain open for signature and can be signed at United Nations Headquarters. States who wish to sign the Treaty should contact the Treaty Section in the Office for Legal Affairs in the UN Secretariat (phone +1-212-963-5047, fax +1-212-963-3693).