The list of parties to weapons of mass destruction treaties encompasses the states which have signed and ratified, succeeded, or acceded to any of the major multilateral treaties prohibiting or restricting weapons of mass destruction (WMD), in particular nuclear, biological, or chemical weapons.
| Treaty | Year of entry into force | Number of States parties | Number of signatory states (signed but not ratified) | Objective |
|---|---|---|---|---|
| Geneva Protocol [1] | 1928 | 146 | 0 | Ban the use of biological and chemical weapons |
| Biological Weapons Convention [2] (parties) | 1975 | 187 | 4 | Comprehensively ban biological weapons |
| Chemical Weapons Convention [3] (parties) | 1997 | 193 | 1 | Comprehensively ban chemical weapons |
| Partial Nuclear Test Ban Treaty [4] (parties) | 1963 | 126 | 10 | Ban all nuclear weapons tests except for those conducted underground |
| Nuclear Non-Proliferation Treaty [5] (parties) | 1970 | 191 | 0 | 1. prevent nuclear proliferation; 2. promote nuclear disarmament; 3. promote peaceful uses of nuclear energy |
| Treaty on the Prohibition of Nuclear Weapons [6] (parties) | 2021 | 73 | 25 | Comprehensively ban nuclear weapons |
| Comprehensive Nuclear-Test-Ban Treaty [7] (parties) | not in force | 178 | 9 | Ban all nuclear weapons tests |
The following list was last updated in March 2021.
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