Sierra Leone

1925 Geneva Protocol
Deposit of instruments of accession (Paris) 20 March 1967  
Anti-Personnel Mine Ban Convention
Signature (UN) 29 July 1998  
Deposit of instruments of ratification (UN) 25 April 2001  
Arms Trade Treaty
Signature (UN) 25 September 2013  
Deposit of instruments of ratification (UN) 12 August 2014  
Biological Weapons Convention
Signature (Washington) 7 November 1972  
Signature (London) 24 November 1972  
Deposit of instruments of ratification (Washington) 29 June 1976  
Deposit of instruments of ratification (London) 29 June 1976  
Deposit of instruments of ratification (Moscow) 29 June 1976  
Chemical Weapons Convention
Signature (UN) 15 January 1993  
Deposit of instruments of ratification (UN) 30 September 2004  
Comprehensive Nuclear-Test-Ban Treaty
Signature (UN) 8 September 2000  
Deposit of instruments of ratification (UN) 17 September 2001  
Convention on Certain Conventional Weapons
Signature (UN) 1 May 1981  
Deposit of instruments of ratification of Amendment to the Convention on Certain Conventional Weapons (UN) 30 September 2004  
Deposit of instruments of ratification (UN) 30 September 2004  
Consent to be bound to Protocol IV on Blinding Laser Weapons (UN) 30 September 2004  
Consent to be bound to Amended Protocol II on the Use of Mines, Booby-Traps and Other Devices (UN) 30 September 2004  
Consent to be bound to Protocol III to the Convention on Certain Conventional Weapons (UN) 30 September 2004  
Consent to be bound to Protocol I to the Convention on Certain Conventional Weapons (UN) 30 September 2004  
Consent to be bound to Protocol V on Explosive Remnants of War (UN) 30 September 2004  
Convention on Cluster Munitions
Signature (UN) 3 December 2008  
Deposit of instruments of ratification (UN) 3 December 2008  
Convention on Environmental Modification Techniques (ENMOD)
Signature (UN) 12 April 1978  
International Convention for the Suppression of Acts of Nuclear Terrorism
Signature (UN) 14 September 2005  
Outer Space Treaty
Signature (Moscow) 27 January 1967  
Signature (London) 27 January 1967  
Signature (Washington) 16 May 1967  
Deposit of instruments of ratification (Washington) 14 July 1967  
Deposit of instruments of ratification (London) 25 October 1967  
Deposit of instruments of ratification (Moscow) 13 July 1967  
Partial Test Ban Treaty
Signature (Washington) 11 September 1963  
Signature (Moscow) 4 September 1963  
Signature (London) 4 September 1963  
Deposit of instruments of ratification (London) 21 February 1964  
Deposit of instruments of ratification (Washington) 4 March 1964  
Deposit of instruments of ratification (Moscow) 29 April 1964  
Pelindaba Treaty
Signature (African Union) 11 April 1996  
Sea-Bed Treaty
Signature (London) 11 February 1971  
Signature (Washington) 24 February 1971  
Signature (Moscow) 12 February 1971  
Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
Deposit of instruments of accession (London) 26 February 1975  
Deposit of instruments of accession (Washington) 26 February 1975  
Deposit of instruments of accession (Moscow) 26 February 1975