There are currently 54 States Parties and 20 Signatories* to the Optional Protocol
| 54 States Parties | 20 Signatories* |
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| Albania | 01 October 2003 |
Australia | 19 May 2009 | |
| Argentina | 15 November 2004 | Austria | 25 September 2003 | |
| Armenia | 14 September 2006 | Belgium | 24 October 2005 | |
| Azerbaijan |
28 January 2009 |
Cameroon | 15 December 2009 | |
| Benin |
20 September 2006 |
Congo, Republic of the | 29 September 2008 | |
| Bolivia | 23 May 2006 |
Finland | 23 September 2003 | |
| Bosnia and Herzegovina | 24 October 2008 |
Gabon | 15 December 2004 | |
| Burkina Faso | 07 July 2010 | Ghana | 06 November 2006 | |
| Brazil | 12 January 2007 | Guinea | 16 September 2005 | |
| Cambodia |
30 March 2007 |
Iceland | 24 September 2003 | |
| Chile |
12 December 2008 |
Ireland | 02 October 2007 | |
| Costa Rica | 01 December 2005 |
Italy | 20 August 2003 | |
| Croatia | 25 April 2005 |
Madagascar | 24 September 2003 | |
| Cyprus |
29 April 2009 |
Netherlands | 03 June 2005 | |
| Czech Republic | 10 July 2006 |
Norway | 24 September 2003 | |
| Denmark | 25 June 2004 |
Portugal | 15 February 2006 | |
| Ecuador | 20 July 2010 | Sierra Leone | 26 September 2003 | |
| Estonia | 18 December 2006 |
South Africa | 20 September 2006 | |
| Former Yugoslav Republic of Macedonia |
13 February 2009 |
Timor-Leste | 16 September 2005 | |
| France |
11 November 2008 |
Turkey | 14 September 2005 | |
| Georgia | 09 August 2005 |
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| Germany |
04 December 2008 |
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| Guatemala |
09 June 2008 |
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| Honduras | 23 May 2006 |
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| Kazakhstan |
22 October 2008 |
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| Kyrgyzstan |
29 December 2008 |
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| Lebanon |
22 December 2008 |
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| Liberia | 22 September 2004 | |||
| Liechtenstein | 03 November 2006 | |||
| Luxembourg |
19 May 2010 |
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| Maldives | 15 February 2006 |
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| Mali | 12 May 2005 |
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| Malta | 24 September 2003 |
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| Mauritius | 21 June 2005 |
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| Mexico | 11 April 2005 |
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| Montenegro |
06 March 2009 |
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| New Zealand | 14 March 2007 |
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| Nicaragua |
25 February 2009 |
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| Nigeria |
27 July 2009 |
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| Paraguay | 02 December 2005 |
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| Peru | 14 September 2006 | |||
| Poland | 14 September 2005 |
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| Republic of Moldova | 24 July 2006 |
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| Romania |
02 July 2009 |
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| Senegal | 18 October 2006 |
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| Serbia | 26 September 2006 | |||
| Slovenia | 23 January 2007 | |||
| Spain | 04 April 2006 |
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| Sweden | 14 September 2005 |
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| Switzerland |
24 September 2009 |
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| Togo | 20 July 2010 | |||
| Ukraine | 19 September 2006 | |||
| United Kingdom | 10 December 2003 | |||
| Uruguay | 08 December 2005 | |||
*Signatories: Not taken into account are States that have already ratified or acceeded to the OPCAT
