The Conference of the States Parties oversees the implementation of the Chemical Weapons Convention, promotes the treaty’s objectives and reviews compliance with the treaty. The Conference is composed of representatives of all Member States of the OPCW, each of which has one vote. The CSP meets annually in The Hague.

The Convention foresees that the States Parties should every five years undertake a review of the implementation process. These Review Conferences serve as fora for the assessment and evaluation of the CWC’s implementation, and the identification of areas where change is needed.

Registration Closed

The application process is now closed for Non-Governmental Organisations (NGOs) interested in attending the Twenty-Third Session of the Conference of the States Parties (CSP-23) to the Chemical Weapons Convention (CWC), and the Fourth Conference of the States Parties to Review the Operation of the CWC (RC-4).

  • CSP-23 will be held on Monday 19 November and Tuesday 20 November 2018.
  • RC-4 will be held on working days between Wednesday 21 November and Friday 30 November.

Registration of previous NGO participants

NGOs approved to attend the 2017 Conference of the States Parties (CSP-22) are anticipated to be accepted to attend CSP-23 and RC-4. This participation, however, is contingent upon the review and decision of the General Committee for CSP-23 and the General Committee for RC-4.

Decision on application

The General Committee for CSP-23 and the General Committee for RC-4 are expected to review and decide on submitted applications by mid-September 2018.

Afterwards, NGOs will receive an email notification. This timing is intended to allow sufficient time to make travel and visa arrangements.

Financial support

Limited financial support for NGOs to attend CSP-23 and RC-4 is available from the OPCW (thanks to European Union funds) and the Chemical Weapons Convention Coalition (CWC Coalition).

All NGOs interested in obtaining this support should contact the CWC Coalition before 18:00 CET on Friday 10 August 2018.  

Requests should be directed to Dr Paul Walker, CWC Coalition Coordinator, at pwalker [at]


NGOs are responsible for securing any visas required for entry into the Netherlands. Visas may be obtained from consular missions of the Netherlands.

NGO representatives whose country of residence does not have a consular mission of the Netherlands may instead obtain a visa from the mission of another country that is party to the Schengen Agreement and is responsible for issuing visas on behalf of the Netherlands.  

If a Note Verbale is required for the visa application, please contact the OPCW visa section.

NGOs should contact the OPCW Visa Section only after their application has been approved by the General Committees to CSP-23 and RC-4. The General Committees are expected to review and decide on submitted applications by mid-September 2018.

NGO Exhibits

Exhibition space is available for NGOs to showcase their activities and achievements in promoting the aims of the Chemical Weapons Convention (CWC).

See further details about Exhibits and Frequently Asked Questions


Financial Support
Email: pwalker [at]
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