| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
| Afghanistan | July 8, 1965 | | | |
| Argentina | December 29, 1965 | | | |
| Australia | | Accession: May 2, 1972 | June 1, 1972 | |
| Belarus | December 28, 1965 | Ratification: July 11, 1972 | August 10, 1972 | Details |
| Belgium | December 30, 1965 | Ratification: April 21, 1970 | May 21, 1970 | Details |
| Bolivia (Plurinational State of) | December 29, 1965 | | | Details |
| Brazil | August 4, 1965 | | | |
| Burkina Faso | | Accession: March 23, 1987 | April 22, 1987 | |
| Burundi | | Accession: May 1, 1968 | May 31, 1968 | |
| Cameroon | August 10, 1965 | | | |
| Central African Republic | December 30, 1965 | Ratification: August 9, 1989 | September 8, 1989 | |
| Chad | | Accession: March 2, 1967 | June 9, 1967 | |
| Chile | December 20, 1965 | Ratification: October 25, 1972 | November 24, 1972 | Details |
| Croatia | | Declaration / Notification of Succession: August 3, 1992 | October 8, 1991 | Details |
| Czech Republic | | Declaration / Notification of Succession: September 30, 1993 | January 1, 1993 | Details |
| Denmark | | Accession: March 26, 1969 | April 25, 1969 | |
| Finland | | Accession: January 22, 1971 | February 21, 1971 | |
| Georgia | | Accession: June 2, 1999 | July 2, 1999 | |
| Germany | December 20, 1965 | | | Details |
| Holy See | December 30, 1965 | | | |
| Hungary | December 30, 1965 | Ratification: September 20, 1967 | October 20, 1967 | Details |
| Italy | December 31, 1965 | | | Details |
| Kazakhstan | | Accession: November 1, 2007 | December 1, 2007 | |
| Lao People's Democratic Republic | July 8, 1965 | Ratification: December 29, 1967 | January 28, 1968 | |
| Lesotho | | Accession: May 28, 1969 | June 27, 1969 | |
| Luxembourg | December 28, 1965 | | | Details |
| Malawi | | Accession: December 12, 1966 | June 9, 1967 | |
| Mali | | Accession: October 11, 1967 | November 10, 1967 | |
| Mongolia | | Accession: July 26, 1966 | June 9, 1967 | Details |
| Montenegro | | Declaration / Notification of Succession: October 23, 2006 | June 3, 2006 | |
| Nepal | July 9, 1965 | Ratification: August 22, 1966 | June 9, 1967 | |
| Netherlands | December 30, 1965 | Ratification: November 30, 1971 | December 30, 1971 | |
| Niger | | Accession: June 3, 1966 | June 9, 1967 | |
| Nigeria | | Accession: May 16, 1966 | June 9, 1967 | |
| Norway | | Accession: September 17, 1968 | October 17, 1968 | |
| Paraguay | December 23, 1965 | | | |
| Russian Federation | December 28, 1965 | Ratification: July 21, 1972 | August 20, 1972 | Details |
| Rwanda | July 23, 1965 | Ratification: August 13, 1968 | September 12, 1968 | |
| San Marino | July 23, 1965 | Ratification: June 12, 1968 | July 12, 1968 | |
| Senegal | | Accession: August 5, 1985 | September 4, 1985 | |
| Serbia | | Declaration / Notification of Succession: March 12, 2001 | April 27, 1992 | Details |
| Slovakia | | Declaration / Notification of Succession: May 28, 1993 | January 1, 1993 | Details |
| Spain | | Accession: May 5, 2010 | June 4, 2010 | |
| Sudan | August 11, 1965 | | | Details |
| Swaziland | | Accession: May 26, 1969 | June 25, 1969 | |
| Sweden | | Accession: June 16, 1971 | July 16, 1971 | |
| Switzerland | December 10, 1965 | | | |
| Tajikistan | | Accession: July 13, 2011 | August 12, 2011 | |
| Turkey | | Accession: March 25, 1969 | April 24, 1969 | |
| Uganda | December 21, 1965 | | | |
| Ukraine | December 31, 1965 | Ratification: July 21, 1972 | August 20, 1972 | Details |
| United States of America | December 30, 1965 | Ratification: October 29, 1968 | November 28, 1968 | |
| Uzbekistan | | Accession: February 7, 1996 | March 8, 1996 | |
| Zambia | December 23, 1965 | Ratification: December 2, 1966 | June 9, 1967 | |