Portugal

1925 Geneva Protocol
Signature (Paris) 17 June 1925  
Deposit of instruments of ratification (Paris) 1 July 1930 *
Antarctic Treaty
Deposit of instruments of accession (Washington) 29 January 2010  
Anti-Personnel Mine Ban Convention
Signature (UN) 3 December 1997  
Deposit of instruments of ratification (UN) 19 February 1999  
Arms Trade Treaty
Signature (UN) 3 June 2013  
Deposit of instruments of ratification (UN) 25 September 2014  
Biological Weapons Convention
Signature (Washington) 29 June 1972  
Deposit of instruments of ratification (Washington) 15 May 1975  
Deposit of instruments of ratification (London) 15 May 1975  
Deposit of instruments of accession (Moscow) 15 May 1975  
Chemical Weapons Convention
Signature (UN) 13 January 1993 *
Deposit of instruments of ratification (UN) 10 September 1996 *
Comprehensive Nuclear-Test-Ban Treaty
Signature (UN) 24 September 1996  
Deposit of instruments of ratification (UN) 26 June 2000  
Convention on Certain Conventional Weapons
Signature (UN) 10 April 1981  
Deposit of instruments of ratification (UN) 4 April 1997 *
Deposit of instruments of ratification of Amendment to the Convention on Certain Conventional Weapons (UN) 22 February 2008  
Consent to be bound to Amended Protocol II on the Use of Mines, Booby-Traps and Other Devices (UN) 31 March 1999  
Consent to be bound to Protocol V on Explosive Remnants of War (UN) 22 February 2008  
Consent to be bound to Protocol III to the Convention on Certain Conventional Weapons (UN) 4 April 1997  
Consent to be bound to Protocol I to the Convention on Certain Conventional Weapons (UN) 4 April 1997  
Consent to be bound to Protocol IV on Blinding Laser Weapons (UN) 12 November 2001  
Consent to be bound to Protocol II to the Convention on Certain Conventional Weapons (UN) 4 April 1997  
Convention on Cluster Munitions
Signature (UN) 3 December 2008  
Deposit of instruments of ratification (UN) 9 March 2011  
Convention on Environmental Modification Techniques (ENMOD)
Signature (UN) 18 May 1977  
International Convention for the Suppression of Acts of Nuclear Terrorism
Signature (UN) 21 September 2005  
Deposit of instruments of ratification (UN) 25 September 2014  
Outer Space Treaty
Deposit of instruments of accession (London) 29 May 1996 *
Partial Test Ban Treaty
Signature (London) 9 October 1963  
Signature (Washington) 9 October 1963  
Sea-Bed Treaty
Deposit of instruments of accession (Washington) 24 June 1975  
Deposit of instruments of accession (Moscow) 24 June 1975  
Deposit of instruments of accession (London) 24 June 1975  
Treaty on Conventional Armed Forces in Europe (CFE)
Signature (The Hague) 19 November 1990  
Signature to Agreement on Adaptation of the Treaty on Conventional Armed Forces in Europe (The Hague) 19 November 1999  
Deposit of instruments of ratification (The Hague) 14 August 1992 *
Treaty on Open Skies
Signature (Budapest) 24 March 1992  
Signature (Ottawa) 24 March 1992  
Deposit of instruments of ratification (Budapest) 22 November 1994  
Deposit of instruments of ratification (Ottawa) 22 November 1994  
Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
Deposit of instruments of accession (London) 15 December 1977  
Deposit of instruments of accession (Washington) 15 December 1977  
Deposit of instruments of accession (Moscow) 15 December 1977