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States Parties

Holy See

State with nuclear-free security policy

The Holy See 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 (20 Sep 2017)
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) N/A
Participated in treaty negotiations (% women) Yes (22%)
Vote on adoption of treaty text Voted yes
Last vote on UNGA resolution N/A
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 No
Ratified the CTBT Yes
Party to the PTBT No
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

The Holy See has on multiple occasions expressed grave concern over the catastrophic humanitarian and environmental effects of the use of nuclear weapons. In November 2017, Pope Francis maintained that 'the possession of nuclear weapons should be firmly condemned.' He also said that the existence of nuclear weapons 'creates a false sense of security that holds international relations hostage and stifles peaceful coexistence'. On 26 September 2019, Secretary of State Cardinal Pietro Parolin, said in the UN that the Holy See 'acknowledges with satisfaction the increasing number of states who have ratified the Treaty on the Prohibition of Nuclear Weapons and encourages those states who have already signed it to ratify it as soon as possible. We believe that the treaty is an important step towards a nuclear-weapons-free world and complements the NPT.' See:,


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