53 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. ] :
| | ARGENTINE | (Buenos Aires a + Olivos r) | | President Arturo Frondizi | | |
| | AUSTRIA | (Vienna) | | President Adolf Schaerf | | |
| | BELGIUM | (Brussels) | | King Baudoin I | | |
| | BULGARIA | (Sofia) | | Todor Zhivkov | | |
| | BOLIVIA | (Sucre cj + La Paz eir) | | President Hernan Siles Zuazo | | |
| | BRAZIL | (Rio de Janeiro a + Brasilia f) | | President Juscelino Kubitschek | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Thomas Holenstein | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Carlos Ibanez del Campo | | |
| | COLOMBIA | (Bogota) | | President Alberto Lleras Camargo | | |
| | CZECHOSLOVAKIA | (Prague a) | | Antonin Novotny | | |
| | CUBA | (Havana) | | President Fulgencio Batista | | |
| | WEST GERMANY | (Bonn ar + Karlsruhe d) | | Bundespresident Theodor Heuss | | |
| | DENMARK | (Copenhagen) | | King Frederick IX | | |
| | DOMINICAN | (Ciudad Trujillo) | | Generalissimo Rafael Leonidas Trujillo | | |
| | ECUADOR | (San Francisco of Quito) | | President Camilo Ponce Enriquez | | |
| | SPAIN | (Madrid) | | Caudillo Francisco Franco | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Urho Kekkonen | | |
| | FRANCE | (Paris) | | President Rene Coty | | |
| | GREECE | (Athens a) | | King Paul I | | |
| | GUATEMALA | (Guatemala City) | | President Miguel Ydigoras Fuentes | | |
| | HAITI | (Port Au Prince) | | President Francois Duvalier Papa Doc | | |
| | HUNGARY | (Budapest a) | | Janos Kadar | | |
| | INDIA | (New Delhi a + Simla s + Bolarum w) | | President Rajendra Prasad | | |
| | IRAN | (Tehran) | | Mohammad Reza Shah Pahlavi | | |
| | ICELAND | (Reykjavik a + Alftanes r) | | President Asgeir Asgeirsson | | |
| | ITALY | (Rome a) | | President Giovanni Gronchi | | |
| | JAPAN | (Tokyo) | | Emperor Hirohito | | |
| | CAMBODIA | (Phnom Penh) | | King Norodom Suramarit | | |
| | LAOS | (Vientiane a + Luangphrabang r) | | King Sisavang Vong | | |
| | CEYLON | (Colombo a + Kandy r) | | Queen Elizabeth II | | |
| | LUXEMBOURG | (Luxembourg a) | | Grand Duchess Charlotte | | |
| | MEXICO | (Mexico City) | | President Adolfo Ruiz Cortines | | |
| | NICARAGUA | (Managua) | | President Luis Somoza Debayle | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | Queen Juliana | | |
| | NORWAY | (Oslo) | | King Olav V | | |
| | PANAMA | (Panama City) | | President Ernesto de la Guardia | | |
| | PERU | (Lima) | | President Manuel Prado Ugarteche | | |
| | PAKISTAN | (Karachi) | | President Iskander Mirza | | |
| | POLAND | (Warsaw a) | | Wladyslaw Gomulka | | |
| | PORTUGAL | (Lisbon) | | President Americo Thomaz | | |
| | PARAGUAY | (Assumption) | | President Alfredo Stroessner | | |
| | RUMANIA | (Bucharest) | | Gheorghe Gheorghiu-Dej | | |
| | SWEDEN | (Stockholm) | | King Gustav VI Adolphe | | |
| | SOVIET UNION | (Moscow) | | Nikita Khrushchev | | |
| | EL SALVADOR | (San Salvador) | | President Jose Maria Lemus | | |
| | THAILAND | (Bangkok) | | King Rama IX Bhumibol Adulyadej | | |
| | TURKEY | (Ankara a) | | President Celal Bayar | | |
| | CHINA-FORMOSA | (Taipeh t) | | President Chiang Kai-Shek | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | AMERICA | (Washington-District of Columbia) | | President Dwight David Eisenhower | | |
| | URUGUAY | (Montevideo) | | President Carlos Fischer | | |
| | VENEZUELA | (Caracas) | | Wolfgang Larrazabal | | |
| | YUGOSLAVIA | (Belgrade) | | President Josip Broz Tito | | |