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14th Article XIV Conference calls for renewed action for CTBT entry into force

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Verification today, tomorrow, together: Highlights from SnT2025

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IDANT 2025: Leaders in Vienna, New York reaffirm support for nuclear test ban

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Building regional expertise in CTBT verification across East Asia

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Diving deep: CTBTO data helps discover new pygmy blue whale population

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Our Mission

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Ending Nuclear Tests

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Statement by Robert Floyd, Executive Secretary of the CTBTO

Cuba signs tsunami warning agreement with CTBTO

CTBTO Mourns Passing of Ambassador Wolfgang Hoffmann, First Executive Secretary

National Data Centres-for-All Initiative

CTBTO installs cutting-edge data system in Yemen, advancing regional capacity

Schedule of sessions

Working Group B

Sixty-Sixth Session Of Working Group B

09 Mar 2026 -19 Mar 2026

Advisory Group

Sixty-Sixth Session Of The Advisory Group

27 Apr 2026 -30 Apr 2026

Working Group A

Sixty-Ninth Session Of Working Group A

18 May 2026 -19 May 2026

Training and Workshops

Regional Radionuclide Workshop And…

09 Feb -13 Feb 2026

Ndc Training Course - Ndc Waveform Analyst…

10 Nov -05 Dec 2025

Technical Training For Ims Infrasound…

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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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