Costa Rica

1925 Geneva Protocol
Deposit of instruments of accession (Paris) 22 July 2009  
Anti-Personnel Mine Ban Convention
Signature (UN) 3 December 1997  
Deposit of instruments of ratification (UN) 17 March 1999  
Arms Trade Treaty
Signature (UN) 3 June 2013  
Deposit of instruments of ratification (UN) 25 September 2013 *
Biological Weapons Convention
Signature (Washington) 10 April 1972  
Deposit of instruments of ratification (Washington) 17 December 1973  
Chemical Weapons Convention
Signature (UN) 14 January 1993  
Deposit of instruments of ratification (UN) 31 May 1996  
Comprehensive Nuclear-Test-Ban Treaty
Signature (UN) 24 September 1996  
Deposit of instruments of ratification (UN) 25 September 2001  
Convention on Certain Conventional Weapons
Deposit of instruments of ratification of Amendment to the Convention on Certain Conventional Weapons (UN) 3 June 2009  
Deposit of instruments of accession (UN) 17 December 1998  
Consent to be bound to Protocol IV on Blinding Laser Weapons (UN) 17 December 1998  
Consent to be bound to Amended Protocol II on the Use of Mines, Booby-Traps and Other Devices (UN) 17 December 1998  
Consent to be bound to Protocol I to the Convention on Certain Conventional Weapons (UN) 17 December 1998  
Consent to be bound to Protocol V on Explosive Remnants of War (UN) 27 April 2009  
Consent to be bound to Protocol III to the Convention on Certain Conventional Weapons (UN) 17 December 1998  
Consent to be bound to Protocol II to the Convention on Certain Conventional Weapons (UN) 17 December 1998  
Convention on Cluster Munitions
Signature (UN) 3 December 2008  
Deposit of instruments of ratification (UN) 28 April 2011  
Convention on Environmental Modification Techniques (ENMOD)
Deposit of instruments of accession (UN) 7 February 1996  
Inter-American Convention on Firearms
Signature (OAS) 14 November 1997  
Deposit of instruments of ratification (OAS) 26 April 2001 *
Inter-American Convention on Transparency
Signature (OAS) 7 June 1999  
Deposit of instruments of ratification (OAS) 12 May 2011  
International Convention for the Suppression of Acts of Nuclear Terrorism
Signature (UN) 15 September 2005  
Deposit of instruments of ratification (UN) 21 February 2013 *
Partial Test Ban Treaty
Signature (London) 9 August 1963  
Signature (Moscow) 23 August 1963  
Signature (Washington) 13 August 1963  
Deposit of instruments of ratification (Washington) 10 July 1967  
Sea-Bed Treaty
Signature (Washington) 11 February 1971  
Treaty of Tlatelolco
Signature to Resolution 268 to the Treaty of Tlatelolco (Mexico City) 3 September 1991  
Signature to Resolution 290 to the Treaty of Tlatelolco (Mexico City) 26 August 1992  
Signature (Mexico City) 14 February 1967  
Signature to Resolution 267 to the Treaty of Tlatelolco (Mexico City) 10 December 1990  
Deposit of instruments of ratification of Resolution 267 to the Treaty of Tlatelolco (Mexico City) 20 January 1999  
Deposit of instruments of ratification of Resolution 268 to the Treaty of Tlatelolco (Mexico City) 20 January 1999  
Deposit of instruments of ratification (Mexico City) 25 August 1969  
Deposit of instruments of ratification of Resolution 290 to the Treaty of Tlatelolco (Mexico City) 20 January 1999  
Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
Signature (Washington) 1 July 1968  
Deposit of instruments of ratification (Washington) 3 March 1970