Spain

1925 Geneva Protocol
Signature (Paris) 17 June 1925  
Deposit of instruments of ratification (Paris) 22 August 1929 *
Antarctic Treaty
Deposit of instruments of accession (Washington) 31 March 1982  
Anti-Personnel Mine Ban Convention
Signature (UN) 3 December 1997  
Deposit of instruments of ratification (UN) 19 January 1999  
Arms Trade Treaty
Signature (UN) 3 June 2013 *
Deposit of instruments of ratification (UN) 2 April 2014  
Biological Weapons Convention
Signature (London) 10 April 1972  
Signature (Washington) 10 April 1972  
Deposit of instruments of ratification (London) 20 June 1979  
Deposit of instruments of ratification (Washington) 20 June 1979  
Chemical Weapons Convention
Signature (UN) 13 January 1993 *
Deposit of instruments of ratification (UN) 3 August 1994 *
Comprehensive Nuclear-Test-Ban Treaty
Signature (UN) 24 September 1996  
Deposit of instruments of ratification (UN) 31 July 1998  
Convention on Certain Conventional Weapons
Signature (UN) 10 April 1981  
Deposit of instruments of ratification (UN) 29 December 1993 *
Deposit of instruments of ratification of Amendment to the Convention on Certain Conventional Weapons (UN) 9 February 2004  
Consent to be bound to Protocol III to the Convention on Certain Conventional Weapons (UN) 29 December 1993  
Consent to be bound to Protocol I to the Convention on Certain Conventional Weapons (UN) 29 December 1993  
Consent to be bound to Protocol IV on Blinding Laser Weapons (UN) 19 January 1998  
Consent to be bound to Protocol II to the Convention on Certain Conventional Weapons (UN) 29 December 1993  
Consent to be bound to Protocol V on Explosive Remnants of War (UN) 9 February 2007  
Consent to be bound to Amended Protocol II on the Use of Mines, Booby-Traps and Other Devices (UN) 27 January 1998  
Convention on Cluster Munitions
Signature (UN) 3 December 2008  
Deposit of instruments of ratification (UN) 17 June 2009  
Convention on Environmental Modification Techniques (ENMOD)
Signature (UN) 18 May 1977  
Deposit of instruments of ratification (UN) 19 July 1978  
International Convention for the Suppression of Acts of Nuclear Terrorism
Signature (UN) 14 September 2005  
Deposit of instruments of ratification (UN) 22 February 2007  
Outer Space Treaty
Deposit of instruments of accession (Washington) 7 December 1968  
Deposit of instruments of accession (London) 27 November 1968  
Partial Test Ban Treaty
Signature (London) 14 August 1963  
Signature (Washington) 13 August 1963  
Deposit of instruments of ratification (Washington) 17 December 1964  
Deposit of instruments of ratification (London) 17 December 1964  
Sea-Bed Treaty
Deposit of instruments of accession (Moscow) 15 July 1987  
Deposit of instruments of accession (Washington) 15 July 1987  
Deposit of instruments of accession (London) 15 July 1987  
Treaty on Conventional Armed Forces in Europe (CFE)
Signature to Agreement on Adaptation of the Treaty on Conventional Armed Forces in Europe (The Hague) 19 November 1999  
Signature (The Hague) 19 November 1990  
Deposit of instruments of ratification (The Hague) 1 June 1992 *
Treaty on Open Skies
Signature (Budapest) 24 March 1992 *
Signature (Ottawa) 24 March 1992 *
Deposit of instruments of ratification (Budapest) 18 November 1993  
Deposit of instruments of ratification (Ottawa) 18 November 1993  
Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
Deposit of instruments of accession (London) 5 November 1987  
Deposit of instruments of accession (Washington) 5 November 1987  
Deposit of instruments of accession (Moscow) 5 November 1987