| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
| Albania | | Accession: November 4, 2003 | February 4, 2004 | Details |
| Algeria | | Accession: May 28, 1973 | August 28, 1973 | Details |
| Andorra | September 6, 1952 | Ratification: December 31, 1952 | September 16, 1955 | Details |
| Argentina | September 6, 1952 | Ratification: November 13, 1957 | February 13, 1958 | |
| Australia | September 6, 1952 | Ratification: February 1, 1969 | May 1, 1969 | |
| Austria | September 6, 1952 | Ratification: April 2, 1957 | July 2, 1957 | |
| Azerbaijan | | Declaration / Notification of Succession: April 7, 1997 | October 18, 1991 | |
| Bahamas | | Declaration / Notification of Succession: July 13, 1976 | July 13, 1976 | |
| Bangladesh | | Accession: May 5, 1975 | August 5, 1975 | Details |
| Barbados | | Accession: March 18, 1983 | June 18, 1983 | Details |
| Belarus | | Declaration / Notification of Succession: March 29, 1994 | July 27, 1991 | |
| Belgium | December 30, 1952 | Ratification: May 31, 1960 | August 31, 1960 | Details |
| Belize | | Declaration / Notification of Succession: December 1, 1982 | September 21, 1981 | |
| Bolivia (Plurinational State of) | | Accession: December 22, 1989 | March 22, 1990 | Details |
| Bosnia and Herzegovina | | Declaration / Notification of Succession: July 12, 1993 | March 6, 1992 | |
| Brazil | September 6, 1952 | Ratification: October 13, 1959 | January 13, 1960 | |
| Bulgaria | | Accession: March 7, 1975 | June 7, 1975 | Details |
| Cambodia | | Accession: August 3, 1953 | September 16, 1955 | |
| Cameroon | | Accession: February 1, 1973 | May 1, 1973 | Details |
| Canada | September 6, 1952 | Ratification: May 10, 1962 | August 10, 1962 | |
| Chile | September 6, 1952 | Ratification: January 18, 1955 | September 16, 1955 | |
| China | | Accession: July 30, 1992 | October 30, 1992 | Details |
| Colombia | | Accession: March 18, 1976 | June 18, 1976 | Details |
| Costa Rica | | Accession: December 7, 1954 | September 16, 1955 | |
| Croatia | | Declaration / Notification of Succession: July 6, 1992 | October 8, 1991 | |
| Cuba | September 6, 1952 | Ratification: March 18, 1957 | June 18, 1957 | |
| Cyprus | | Accession: September 19, 1990 | December 19, 1990 | Details |
| Czech Republic | | Declaration / Notification of Succession: March 26, 1993 | January 1, 1993 | |
| Denmark | September 6, 1952 | Ratification: November 9, 1961 | February 9, 1962 | |
| Dominican Republic | | Accession: February 8, 1983 | May 8, 1983 | Details |
| Ecuador | | Accession: March 5, 1957 | June 5, 1957 | |
| El Salvador | September 6, 1952 | Accession: December 29, 1978 | March 29, 1979 | Details |
| Fiji | | Declaration / Notification of Succession: December 13, 1971 | October 10, 1970 | |
| Finland | September 6, 1952 | Ratification: January 16, 1963 | April 16, 1963 | |
| France | September 6, 1952 | Ratification: October 14, 1955 | January 14, 1956 | Details |
| Germany | September 6, 1952 | Ratification: June 3, 1955 | September 16, 1955 | Details |
| Ghana | | Accession: May 22, 1962 | August 22, 1962 | |
| Greece | | Accession: May 24, 1963 | August 24, 1963 | |
| Guatemala | September 6, 1952 | Ratification: July 28, 1964 | October 28, 1964 | |
| Guinea | | Accession: August 13, 1981 | November 13, 1981 | Details |
| Haiti | September 6, 1952 | Ratification: September 1, 1954 | September 16, 1955 | |
| Holy See | September 6, 1952 | Ratification: July 5, 1955 | October 5, 1955 | |
| Honduras | September 6, 1952 | | | |
| Hungary | | Accession: October 23, 1970 | January 23, 1971 | Details |
| Iceland | | Accession: September 18, 1956 | December 18, 1956 | |
| India | September 6, 1952 | Ratification: October 21, 1957 | January 21, 1958 | |
| Ireland | September 6, 1952 | Ratification: October 20, 1958 | January 20, 1959 | |
| Israel | December 16, 1952 | Ratification: April 6, 1955 | September 16, 1955 | |
| Italy | September 6, 1952 | Ratification: October 24, 1956 | January 24, 1957 | |
| Japan | January 3, 1953 | Ratification: January 28, 1956 | April 28, 1956 | |
| Kazakhstan | | Declaration / Notification of Succession: August 6, 1992 | December 16, 1991 | |
| Kenya | | Accession: June 7, 1966 | June 7, 1966 | |
| Lao People's Democratic Republic | | Accession: August 19, 1954 | September 16, 1955 | |
| Lebanon | | Accession: July 17, 1959 | October 17, 1959 | |
| Liberia | September 6, 1952 | Ratification: April 27, 1956 | July 27, 1956 | |
| Liechtenstein | | Accession: October 22, 1958 | January 22, 1959 | |
| Luxembourg | September 6, 1952 | Ratification: July 15, 1955 | October 15, 1955 | |
| Malawi | | Accession: July 26, 1965 | October 26, 1965 | |
| Malta | | Accession: August 19, 1968 | November 19, 1968 | |
| Mauritius | | Declaration / Notification of Succession: August 20, 1970 | March 12, 1968 | |
| Mexico | September 6, 1952 | Ratification: February 12, 1957 | May 12, 1957 | |
| Monaco | September 6, 1952 | Ratification: June 16, 1955 | September 16, 1955 | |
| Montenegro | | Declaration / Notification of Succession: April 26, 2007 | June 3, 2006 | |
| Morocco | | Accession: February 8, 1972 | May 8, 1972 | |
| Netherlands | September 6, 1952 | Ratification: March 22, 1967 | June 22, 1967 | |
| New Zealand | | Accession: June 11, 1964 | September 11, 1964 | Details |
| Nicaragua | September 6, 1952 | Ratification: May 16, 1961 | August 16, 1961 | |
| Niger | | Accession: February 15, 1989 | May 15, 1989 | Details |
| Nigeria | | Accession: November 14, 1961 | February 14, 1962 | |
| Norway | September 6, 1952 | Ratification: October 23, 1962 | January 23, 1962 | |
| Pakistan | | Accession: April 28, 1954 | September 16, 1955 | |
| Panama | | Accession: July 17, 1962 | October 17, 1962 | |
| Paraguay | | Accession: December 11, 1961 | March 11, 1962 | |
| Peru | December 2, 1952 | Ratification: July 16, 1963 | October 16, 1963 | |
| Philippines | | Accession: August 19, 1955 | November 19, 1955 | |
| Poland | | Accession: December 9, 1976 | March 9, 1977 | Details |
| Portugal | September 6, 1952 | Ratification: September 25, 1956 | December 25, 1956 | Details |
| Republic of Korea | | Accession: July 1, 1987 | October 1, 1987 | Details |
| Republic of Moldova | | Declaration / Notification of Succession: June 23, 1997 | May 27, 1973 | |
| Russian Federation | | Accession: February 27, 1973 | May 27, 1973 | Details |
| Rwanda | | Accession: August 10, 1989 | November 10, 1989 | Details |
| Saint Vincent and the Grenadines | | Declaration / Notification of Succession: January 22, 1985 | October 27, 1979 | |
| San Marino | September 6, 1952 | | | |
| Saudi Arabia | | Accession: April 13, 1994 | July 13, 1994 | Details |
| Senegal | | Accession: April 9, 1974 | July 9, 1974 | Details |
| Serbia | September 6, 1952 | Declaration / Notification of Succession: September 11, 2001 | April 28, 1992 | Details |
| Slovakia | | Declaration / Notification of Succession: March 31, 1993 | January 1, 1993 | |
| Slovenia | | Declaration / Notification of Succession: November 5, 1992 | June 25, 1991 | |
| Spain | September 6, 1952 | Ratification: October 27, 1954 | September 16, 1955 | |
| Sri Lanka | | Accession: October 25, 1983 | January 25, 1984 | Details |
| Sweden | September 6, 1952 | Ratification: April 1, 1961 | July 1, 1961 | |
| Switzerland | September 6, 1952 | Ratification: December 30, 1955 | March 30, 1956 | |
| Tajikistan | | Declaration / Notification of Succession: August 28, 1992 | September 9, 1991 | |
| the former Yugoslav Republic of Macedonia | | Declaration / Notification of Succession: April 30, 1997 | November 17, 1991 | |
| Togo | | Accession: February 28, 2003 | May 28, 2003 | Details |
| Trinidad and Tobago | | Accession: May 19, 1988 | August 19, 1988 | Details |
| Tunisia | | Accession: March 19, 1969 | June 19, 1969 | |
| Ukraine | | Declaration / Notification of Succession: January 17, 1994 | August 24, 1991 | |
| United Kingdom | September 6, 1952 | Ratification: June 27, 1957 | September 27, 1957 | Details |
| United States of America | September 6, 1952 | Ratification: December 6, 1954 | September 16, 1955 | Details |
| Uruguay | September 6, 1952 | Ratification: January 12, 1993 | April 12, 1993 | Details |
| Venezuela (Bolivarian Republic of) | | Accession: June 30, 1966 | September 30, 1966 | |