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States Parties

Costa Rica

Costa Rica was one of the states that played a leading role in bringing about 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.

20 Sep 2017
5 Jul 2018 (Ratification)
22 Jan 2021
Received 22 Jan 2021
TPNW Article 1(1) prohibitions: Compliance in 2021
(a) Develop, produce, manufacture, acquire Compliant
Test Compliant
Possess or stockpile Compliant
(b) Transfer Compliant
(c) Receive transfer or control Compliant
(d) Use Compliant
Threaten to use Compliant
(e) Assist, encourage or induce Compliant
(f) Seek or receive assistance Compliant
(g) Allow stationing, installation, deployment Compliant
TPNW voting and participation
2021 UNGA resolution on TPNW
2020 UNGA resolution on TPNW
2019 UNGA resolution on TPNW Voted yes
2018 UNGA resolution on TPNW Voted yes
Participated in TPNW negotiations Yes
Share of women in TPNW negotiations 75%
Vote on adoption of treaty text Voted yes
Adoption of TPNW (7 July 2017) Voted yes
IAEA safeguards and fissile material
Safeguards Agreement Yes
TPNW Art 3(2) deadline N/A
Small Quantities Protocol Yes (Modified)
Additional Protocol Yes
Fissile material production facilities No
Highly enriched uranium stocks No
Plutonium stocks (mil/civ) No/No
Related treaties and regimes
Party to the BWC Yes
Party to the CWC Yes
Party to the PTBT Yes
Ratified the CTBT Yes
Party to the NPT Yes
Party to a NWFZ Yes (Tlatelolco)
Member of the CD No (Observer)

Latest developments

In the First Committee of the 2021 UN General Assembly, Costa Rica said that the TPNW 'shows us some ways in which it is possible to create a more inclusive and secure future for all'. It added that 'that future will only be possible when the nuclear-weapon states stop multiplying and modernising their nuclear arsenals, when the reductions are verifiable, transparent and carried out with the participation of the International Atomic Energy Agency'.1

Costa Rica was one of the co-sponsors of the 2021 UN General Assembly resolution on the TPNW, which called 'upon all States that have not yet done so to sign, ratify, accept, approve or accede to the Treaty at the earliest possible date'.2


  • 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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