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The Treaty allows for the Parties to gather every five years to review its operation. At the 1995 Review and Extension Conference, the Parties extended the Treaty indefinitely and formalized the practice of convening a Review Conference every five years, as well as holding Preparatory Committee meetings during each of the three years preceding a RevCon. The 2015 NPT RevCon took place at the United Nations in New York in May 2015.

 In May 2017, NPT States Parties gathered at the Vienna International Centre for the 2017 Preparatory Committee under Chair-designate Ambassador Henk Cor Van der Kwast of the Netherlands. All documents and statements are available at the U.S. Mission to International Organizations in Vienna website.

The second of three Preparatory Committee meetings preparing for the 2020 RevCon was held in Geneva from April 23-May 4, 2018. The 2018 Preparatory Committee meeting focused on agreement on procedural issues related to PrepCom III and the 2020 Review Conference. States Parties laid out their national views through general statements

The third and final 2019 Preparatory Committee for the 2020 NPT Review Conference took place at the United Nations headquarters in New York, NY, from April 29-May 10, 2019.  2019 Preparatory Committee

U.S. Department of State

The Lessons of 1989: Freedom and Our Future