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30 Years of the CTBT: Anniversary Commemorations in Vienna, New York

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Mexico becomes 23rd country to sign tsunami warning agreement with CTBTO

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Tonga ratifies CTBT, completing Treaty universalisation in Pacific region

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HA08 North repaired: full hydroacoustic coverage achieved, first for IMS

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US nears IMS completion with Antarctic infrasound station

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Our Mission

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Ending Nuclear Tests

The Treaty

The Organization

Integrated Field Exercise (IFE26)

30 years of the CTBT

Our Work

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Integrated Field Exercise IFE26 begins in Namibia

CTBT marks 30 years as States gather at NPT Review Conference

Statement by Robert Floyd, Executive Secretary of the CTBTO

Namibia to host CTBTO’s Integrated Field Exercise in 2026

Highlights of 2025 voluntary contributions

Schedule of sessions

Working Group A

Seventieth Session Of Working Group A

19 Oct 2026 -21 Oct 2026

Preparatory Commission

Sixty-Seventh Session Of The Preparatory…

25 Nov 2026 -27 Nov 2026

Training and Workshops

Webinar For Expert Meetings On Special…

20 Oct -20 Oct 2026

2026 Ndc Workshop

07 Dec -11 Dec 2026

Ndc Waveform Advanced Analyst Course…

09 Nov -27 Nov 2026

Executive Secretary

Robert Floyd

Selected Statements

Photos Stream

Resources

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Researchers & Experts

Civil Society

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Information Materials

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CTBTO Fact Sheet

International Monitoring System (IMS) Map

Verification Regime Brochure

Civil and Scientific Applications Brochure

On-Site Inspection Brochure

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Join CTBTO on our mission to create a world free of nuclear testing. Learn more about employment and business opportunities with the Provisional Technical Secretariat.

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