Portrait photo of UN Secretary-General António Guterres

The Nuclear Non-Proliferation Treaty is an essential pillar of international peace and security, and the heart of the nuclear disarmament and non-proliferation regime. Its unique status is based on its near universal membership, legally-binding obligations on disarmament, verifiable non-proliferation safeguards regime, and commitment to the peaceful use of nuclear energy"

UN Secretary-General António Guterres on the Fiftieth Anniversary of the NPT’s opening for signature, 24 May 2018, Geneva

What is the NPT?

The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) is a landmark international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote co-operation in the peaceful uses of nuclear energy and to further the goal of achieving nuclear disarmament and general and complete disarmament. The NPT represents the only binding commitment in a multilateral treaty to the goal of disarmament by the nuclear-weapon States.


Opened for signature in 1968, the Treaty entered into force in 1970. Since its entry into force, the NPT has been the cornerstone of global nuclear non-proliferation regime. 191 States parties have joined the Treaty, including the five nuclear-weapon States, making the NPT the most widely adhered to multilateral disarmament agreement.


The Treaty, particularly article VIII, paragraph 3, envisages a review of the operation of the Treaty every five years, a provision which was reaffirmed by the States parties at the 1995 NPT Review and Extension Conference and the 2000 NPT Review Conference.

Preparatory Documents


A view of the General Assembly Hall at UN Headquarters during the closing of the 2015 NPT Review Conference.

Please refer to the relevant section for updated deadlines for registration and submission of applications.

A man examines photographs at the opening of exhibition "Against Nuclear Arms."

Please refer to the relevant section for updated information on side-events and exhibits.

Two journalists videotaping a press encounter.

For the Press Kit & other information relevant to the media, please visit the "Latest Updates & News" page.

View of the general assembly hall.

Important Links



Latest Updates & News