List of parties to the Chemical Weapons Convention

The member states of the Organisation for the Prohibition of Chemical Weapons (OPCW) encompasses the states who have signed and ratified or acceded to the Chemical Weapons Convention, an international agreement outlawing the production, stockpiling and use of chemical weapons.

On January 13, 1993, the Chemical Weapons Convention (CWC) was opened for signature.Fiji became the first state to ratify the treaty on January 20, 1993. The treaty entered into force on April 29, 1997, after it had been ratified by 65 states. The treaty was closed for signature on the preceding day, and states that did not sign the convention can now only accede to it. For states that ratified or acceded to the treaty after this date, the convention entered into force for them 31 days after their deposit of the instrument of ratification or accession.

A total of 197 states may become members of the Chemical Weapons Convention, including all 193 United Nations member states, the Cook Islands, Holy See, Niue and the State of Palestine. As of September 2015, 192 states have ratified or acceded to the treaty (most recently Angola on 16 September 2015) and another state (Israel) has signed but not ratified the treaty. Only Egypt, North Korea, Palestine and newly independent South Sudan have neither signed nor acceded to the treaty. Aside from Palestine, the other four states which are not parties are suspected of possessing chemical weapons.

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