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States Parties

Costa Rica

State with nuclear-free security policy

Costa Rica was at the forefront of the diplomatic process towards a treaty prohibiting nuclear weapons, and Costa Rica’s Permanent Representative to the United Nations in Geneva, Ambassador Elayne Whyte Gómez, chaired the negotiations in 2017 that resulted in the adoption of the TPNW. Costa Rica is a state party to the TPNW from 22 January 2021 and is in compliance with all of the prohibitions in Article 1 of the Treaty.

TPNW status
Signed (20 Sep 2017) and ratified (5 Jul 2018)
Compliance with prohibitions in TPNW Article 1(1)
Art 1(1)(a) Develop, produce, manufacture, acquire Compliant
Test Compliant
Possess or stockpile Compliant
Art 1(1)(b) Transfer Compliant
Art 1(1)(c) Receive transfer or control Compliant
Art 1(1)(d) Use Compliant
Threaten to use Compliant
Art 1(1)(e) Assist, encourage or induce Compliant
Art 1(1)(f) Seek or receive assistance Compliant
Art 1(1)(g) Allow stationing, installation, deployment Compliant
TPNW voting and participation
Vote on negotiation mandate (A/RES/71/258) Voted yes
Participated in treaty negotiations (% women) Yes (75%)
Vote on adoption of treaty text Voted yes
Last vote on UNGA resolution Voted yes
Fissile material
Fissile material production facilities No
Highly enriched uranium stocks No
Plutonium stocks (military/civilian) No/No
Related treaties and regimes
Party to the NPT Yes
Party to a NWFZ Yes (Tlatelolco)
Ratified the CTBT Yes
Party to the PTBT Yes
Member of the CD No (Observer)
IAEA CSA in force Yes
IAEA AP in force Yes
Party to the CWC Yes
Party to the BWC Yes

Latest developments

In First Committee of the 2020 UN General Assembly, Costa Rica pointed out that 'any initiative to prevent the proliferation of nuclear weapons must be joined by a parallel initiative to eliminate all nuclear arms, in a verifiable, irreversible and transparent manner. Costa Rica is also concerned by the apparent lack of urgency and seriousness with which solemn commitments continue to be approached, particularly with respect to nuclear disarmament.' Costa Rica invited all those States that have not yet done so to sign and ratify the TPNW, which it called a 'historic instrument, which complements and strengthens the NPT.' See:


  • Costa Rica should continue to encourage other states to adhere to the TPNW.
  • Costa Rica should ensure that all the TPNW obligations are implemented domestically, through legal, administrative, and other necessary measures.
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