30 Members (excluding the associate or suspended members but including the countries represented on their behalf) [The rulers are not necessarily the representatives in the organisation. ] :
| | AUSTRIA | (Vienna) | | President Franz Jonas | | |
| | AUSTRALIA | (Canberra) | | Queen Elizabeth II | | |
| | BELGIUM | (Brussels) | | King Baudoin I | | |
| | BULGARIA | (Sofia) | | Todor Zhivkov | | |
| | BRAZIL | (Brasilia) | | President Artur da Costa e Silva | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Ludwig von Moos | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Eduardo Frei Montalva | | |
| | CZECHOSLOVAKIA | (Prague a) | | Gustav Husak | | |
| | EAST GERMANY | (East Berlin) | | Walter Ulbricht | | |
| | WEST GERMANY | (Bonn ar + Karlsruhe d) | | Bundespresident Heinrich Luebke | | |
| | DENMARK | (Copenhagen) | | King Frederick IX | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Urho Kekkonen | | |
| | FRANCE | (Paris) | | Alain Poher | | |
| | HUNGARY | (Budapest a) | | Janos Kadar | | |
| | IRELAND | (Dublin) | | President Eamon de Valera | | |
| | INDIA | (New Delhi a + Simla s + Bolarum w) | | Varahagiri Venkata Giri | | |
| | ITALY | (Rome a) | | President Giuseppe Saragat | | |
| | CEYLON | (Colombo a + Kandy r) | | Queen Elizabeth II | | |
| | MEXICO | (Mexico City) | | President Gustavo Diaz Ordaz | | |
| | POLAND | (Warsaw a) | | Wladyslaw Gomulka | | |
| | PORTUGAL | (Lisbon) | | President Americo Thomaz | | |
| | ROMANIA | (Bucharest) | | Nicolae Ceausescu | | |
| | SWEDEN | (Stockholm) | | King Gustav VI Adolphe | | |
| | SOVIET UNION | (Moscow) | | Leonid Brezhnev | | |
| | CHINA-TAIWAN | (Taipeh t) | | President Chiang Kai-Shek | | |
| | UKRAINE | (Kiev) | | Piotr Shelest | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | AMERICA | (Washington-District of Columbia) | | President Richard Nixon | | |
| | SOUTH VIETNAM | (Saigon) | | President Nguyen Van Thieu | | |
| | YUGOSLAVIA | (Belgrade) | | President Josip Broz Tito | | |