| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
| Albania | | Accession: June 23, 2003 | September 22, 2003 | |
| Algeria | | Accession: July 15, 1964 | October 13, 1964 | |
| Antigua and Barbuda | | Declaration / Notification of Succession: October 25, 1988 | November 1, 1981 | Details |
| Argentina | | Accession: June 1, 1972 | August 30, 1972 | Details |
| Armenia | | Accession: May 18, 1994 | August 16, 1994 | |
| Australia | | Accession: December 13, 1973 | March 13, 1974 | |
| Austria | | Accession: February 8, 2008 | May 8, 2008 | Details |
| Azerbaijan | | Accession: August 16, 1996 | November 14, 1996 | |
| Barbados | | Declaration / Notification of Succession: March 6, 1972 | November 30, 1966 | Details |
| Belgium | September 28, 1954 | Ratification: May 27, 1960 | August 25, 1960 | |
| Belize | | Accession: September 14, 2006 | December 13, 2006 | |
| Benin | | Accession: December 8, 2011 | March 7, 2012 | |
| Bolivia (Plurinational State of) | | Accession: October 6, 1983 | January 4, 1984 | |
| Bosnia and Herzegovina | | Declaration / Notification of Succession: September 1, 1993 | March 6, 1992 | Details |
| Botswana | | Declaration / Notification of Succession: February 25, 1969 | September 30, 1966 | Details |
| Brazil | September 28, 1954 | Ratification: August 13, 1996 | November 11, 1996 | |
| Bulgaria | | Accession: March 22, 2012 | June 20, 2012 | Details |
| Burkina Faso | | Accession: May 1, 2012 | July 30, 2012 | |
| Chad | | Accession: August 12, 1999 | November 10, 1999 | |
| China | | | | Details |
| Colombia | December 30, 1954 | | | |
| Costa Rica | September 28, 1954 | Ratification: November 2, 1977 | January 31, 1978 | Details |
| Croatia | | Declaration / Notification of Succession: October 12, 1992 | October 8, 1991 | Details |
| Czech Republic | | Accession: July 19, 2004 | October 17, 2004 | Details |
| Denmark | September 28, 1954 | Ratification: January 17, 1956 | June 6, 1960 | Details |
| Ecuador | September 28, 1954 | Ratification: October 2, 1970 | December 31, 1970 | |
| El Salvador | September 28, 1954 | | | Details |
| Fiji | | Declaration / Notification of Succession: June 12, 1972 | October 10, 1970 | Details |
| Finland | | Accession: October 10, 1968 | January 8, 1969 | Details |
| France | January 12, 1955 | Ratification: March 8, 1960 | June 6, 1960 | Details |
| Georgia | | Accession: December 23, 2011 | March 22, 2012 | |
| Germany | September 28, 1954 | Ratification: October 26, 1976 | January 24, 1977 | Details |
| Greece | | Accession: November 4, 1975 | February 2, 1976 | |
| Guatemala | September 28, 1954 | Ratification: November 28, 2000 | February 26, 2001 | Details |
| Guinea | | Accession: March 21, 1962 | June 19, 1962 | |
| Holy See | September 28, 1954 | | | Details |
| Honduras | September 28, 1954 | Ratification: October 1, 2012 | December 30, 2012 | Details |
| Hungary | | Accession: November 21, 2001 | February 19, 2002 | Details |
| Ireland | | Accession: December 17, 1962 | March 17, 1963 | Details |
| Israel | October 1, 1954 | Ratification: December 23, 1958 | June 6, 1960 | |
| Italy | October 20, 1954 | Ratification: December 3, 1962 | March 3, 1963 | Details |
| Kiribati | | Declaration / Notification of Succession: November 29, 1983 | July 12, 1979 | Details |
| Latvia | | Accession: November 5, 1999 | February 3, 2000 | Details |
| Lesotho | | Declaration / Notification of Succession: November 4, 1974 | November 4, 1974 | Details |
| Liberia | | Accession: September 11, 1964 | December 10, 1964 | |
| Libya | | Accession: May 16, 1989 | August 14, 1989 | |
| Liechtenstein | September 28, 1954 | Ratification: September 25, 2009 | December 24, 2009 | |
| Lithuania | | Accession: February 7, 2000 | May 7, 2000 | |
| Luxembourg | October 28, 1955 | Ratification: June 27, 1960 | September 25, 1960 | |
| Malawi | | Accession: October 7, 2009 | January 5, 2010 | Details |
| Mexico | | Accession: June 7, 2000 | September 5, 2000 | Details |
| Montenegro | | Declaration / Notification of Succession: October 23, 2006 | June 3, 2006 | Details |
| Netherlands | September 28, 1954 | Ratification: April 12, 1962 | July 11, 1962 | Details |
| Nigeria | | Accession: September 20, 2011 | December 19, 2011 | |
| Norway | September 28, 1954 | Ratification: November 19, 1956 | June 6, 1960 | |
| Panama | | Accession: June 2, 2011 | August 31, 2011 | |
| Philippines | June 22, 1955 | Ratification: September 22, 2011 | December 21, 2011 | Details |
| Portugal | | Accession: October 1, 2012 | December 30, 2012 | Details |
| Republic of Korea | | Accession: August 22, 1962 | November 20, 1962 | |
| Republic of Moldova | | Accession: April 19, 2012 | July 18, 2012 | Details |
| Romania | | Accession: January 27, 2006 | April 27, 2006 | Details |
| Rwanda | | Accession: October 4, 2006 | January 2, 2007 | |
| Saint Vincent and the Grenadines | | Declaration / Notification of Succession: April 27, 1999 | October 27, 1979 | Details |
| Senegal | | Accession: September 21, 2005 | December 20, 2005 | |
| Serbia | | Declaration / Notification of Succession: March 12, 2001 | April 27, 1992 | Details |
| Slovakia | | Accession: April 3, 2000 | July 2, 2000 | Details |
| Slovenia | | Declaration / Notification of Succession: July 6, 1992 | June 25, 1991 | Details |
| Spain | | Accession: May 12, 1997 | August 10, 1997 | Details |
| Swaziland | | Accession: November 16, 1999 | February 14, 2000 | |
| Sweden | September 28, 1954 | Ratification: April 2, 1965 | July 1, 1965 | Details |
| Switzerland | September 28, 1954 | Ratification: July 3, 1972 | October 1, 1972 | |
| the former Yugoslav Republic of Macedonia | | Declaration / Notification of Succession: January 18, 1994 | November 17, 1991 | Details |
| Trinidad and Tobago | | Declaration / Notification of Succession: April 11, 1966 | August 31, 1962 | Details |
| Tunisia | | Accession: July 29, 1969 | October 27, 1969 | |
| Turkmenistan | | Accession: December 7, 2011 | March 6, 2012 | |
| Uganda | | Accession: April 15, 1965 | July 14, 1965 | |
| Ukraine | | Accession: March 25, 2013 | June 23, 2013 | |
| United Kingdom | September 28, 1954 | Ratification: April 16, 1959 | June 6, 1960 | Details |
| Uruguay | | Accession: April 2, 2004 | July 1, 2004 | |
| Zambia | | Declaration / Notification of Succession: November 1, 1974 | November 1, 1974 | Details |
| Zimbabwe | | Declaration / Notification of Succession: December 1, 1998 | April 18, 1980 | Details |