66 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. ] :
| | ALBANIA | (Tirana) | | President Bujar Nishani | | |
| | ARMENIA | (Erevan) | | President Serge Sarkisyan | | |
| | AUSTRIA | (Vienna) | | President Heinz Fischer | | |
| | AUSTRALIA | (Canberra) | | Sir Peter Cosgrove | | |
| | AZERBAIJAN | (Baku) | | President Iham Aliyev | | |
| | BOSNIA AND HERZEGOVINA | (Sarajevo) | | President Bakir Izetbegovich | | |
| | BELGIUM | (Brussels) | | King Philippe | | |
| | BULGARIA | (Sofia) | | President Rosen Plevneliev | | |
| | BELARUS | (Minsk) | | President Alexander Lukashenko | | |
| | CANADA | (Ottawa) | | Queen Elizabeth II | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Johann Schneider-Ammann | | |
| | CHINA | (Beijing) | | Xi Jinping | | |
| | CYPRUS | (Nicosia) | | President Nicos Anastasiades | | |
| | CZECHIA | (Prague elr + Brno dj + Lany r) | | President Milos Zeman | | |
| | GERMANY | (Berlin ar + Bonn lr + Karlsruhe d) | | Bundespresident Joachim Gauck | | |
| | DENMARK | (Copenhagen) | | Queen Margaret II | | |
| | ESTONIA | (Tallinn a + Tartu b) | | President Toomas Hendrik Ilves | | |
| | EGYPT | (Cairo a + Alexandria r) | | President Abdel Fattah el-Sisi | | |
| | SPAIN | (Madrid) | | King Philip VI | | |
| | EUROPEAN UNION | (Brussels a + Luxembourg j + Strasbourg l) | | President Jean-Claude Juncker | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Sauli Niinisto | | |
| | FRANCE | (Paris) | | President Francois Hollande | | |
| | GEORGIA | (Tbilisi a + Kutaisi l + Batumi d) | | President Giorgi Margvelashvili | | |
| | GREECE | (Athens a) | | President Prokopis Pavlopoulos | | |
| | CROATIA | (Zagreb) | | President Kolinda Grabar-Kitarovich | | |
| | HUNGARY | (Budapest a) | | President Janos Ader | | |
| | IRELAND | (Dublin) | | President Michael Daniel Higgins | | |
| | ISRAEL | (Jerusalem aru + Tel Aviv-Jaffa in) | | President Reuven Rivlin | | |
| | ICELAND | (Reykjavik a + Alftanes r) | | President Olafur Ragnar Grimsson | | |
| | ITALY | (Rome a) | | President Sergio Mattarella | | |
| | JORDAN | (Amman) | | King Abdullah II | | |
| | JAPAN | (Tokyo) | | Emperor Akihito | | |
| | KYRGYZSTAN | (Bishkek) | | President Almazbek Atambayev | | |
| | SOUTH KOREA | (Seoul adknr + Sejong b) | | President Park Geun-Hye | | |
| | KAZAKHSTAN | (Astana a) | | President Elbashy Nursultan Nazarbayev | | |
| | LIECHTENSTEIN | (Vaduz) | | Prince Hans-Adam II | | |
| | LITHUANIA | (Vilnius) | | President Dalia Grybauskaite | | |
| | LUXEMBOURG | (Luxembourg a) | | Grand Duke Henri | | |
| | LATVIA | (Riga) | | President Raimonds Vejonis | | |
| | MOROCCO | (Rabat a) | | King Muhammad VI | | |
| | MOLDOVA | (Chisinau) | | President Nicolae Timofti | | |
| | MONTENEGRO | (Podgoritsa a + Cetinje hr) | | President Filip Vujanovich | | |
| | MACEDONIA | (Skopje) | | President Gjorge Ivanov | | |
| | MONGOLIA | (Ulan-Bator) | | President Tsakhiagiyn Elbegdorj | | |
| | MALTA | (Valletta a + Attard r + Siggiewi s) | | President Marie-Louise Coleiro Preca | | |
| | MEXICO | (Mexico City) | | President Enrique Pena Nieto | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | King Willem-Alexander | | |
| | NORWAY | (Oslo) | | King Harald V | | |
| | NEW ZEALAND | (Wellington) | | Queen Elizabeth II | | |
| | POLAND | (Warsaw a) | | President Andrzej Duda | | |
| | PORTUGAL | (Lisbon) | | President Marcelo Rebelo de Sousa | | |
| | ROMANIA | (Bucharest) | | President Klaus Iohannis | | |
| | SERBIA | (Belgrade) | | President Tomislav Nikolich | | |
| | RUSSIA | (Moscow a + Saint Petersburg d) | | President Vladimir Putin | | |
| | SWEDEN | (Stockholm) | | King Charles XVI Gustav | | |
| | SLOVENIA | (Ljubljana) | | President Borut Pahor | | |
| | SLOVAKIA | (Bratislava a + Kosice d) | | President Andrej Kiska | | |
| | TAJIKISTAN | (Dushanbe) | | President Emomali Rakhmonov | | |
| | TURKMENISTAN | (Ashgabat) | | President Arkadag Gurbanguly Berdymukhammedov | | |
| | TUNISIA | (Tunis a + Bardois df) | | President Mohamed Beji Caid Essebsi | | |
| | TURKEY | (Ankara a) | | President Recep Tayyip Erdogan | | |
| | UKRAINE | (Kiev) | | President Petro Poroshenko | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | AMERICA | (Washington-District of Columbia) | | President Barack Obama | | |
| | UZBEKISTAN | (Tashkent a + Durman r) | | President Islam Karimov | | |
| | KOSOVO | (Prishtina) | | President Hashim Thaci | | |