83 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. ] :
| | AFGHANISTAN | (Kabul) | | President Ashraf Ghani | | |
| | ALBANIA | (Tirana) | | President Ilir Meta | | |
| | ARMENIA | (Erevan) | | President Armen Sarkisyan | | |
| | AUSTRIA | (Vienna) | | President Alexander Van der Bellen | | |
| | AZERBAIJAN | (Baku) | | President Iham Aliyev | | |
| | BOSNIA AND HERZEGOVINA | (Sarajevo) | | President Milorad Dodik | | |
| | BANGLADESH | (Dhaka a) | | President Abdul Hamid | | |
| | BELGIUM | (Brussels) | | King Philippe | | |
| | BURKINA FASO | (Ouagadougou) | | President Roch Marc Christian Kabore | | |
| | BULGARIA | (Sofia) | | President Rumen Radev | | |
| | BURUNDI | (Gitega a + Bujumbura dnq) | | President Evariste Ndayishimiye | | |
| | BENIN | (Porto Novo a + Cotonou ilnqr) | | President Patrice Talon | | |
| | BOTSWANA | (Gaborone) | | President Mokgweetsi Masisi | | |
| | BELARUS | (Minsk) | | President Alexander Lukashenko | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Guy Parmelin | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Sebastian Pinera | | |
| | CHINA | (Beijing) | | Xi Jinping | | |
| | COLOMBIA | (Bogota) | | President Ivan Duque Marquez | | |
| | CYPRUS | (Nicosia) | | President Nicos Anastasiades | | |
| | CZECHIA | (Prague elr + Brno dj + Lany r) | | President Milos Zeman | | |
| | GERMANY | (Berlin ar + Bonn lr + Karlsruhe d) | | Bundespresident Frank-Walter Steinmeier | | |
| | DENMARK | (Copenhagen) | | Queen Margaret II | | |
| | ESTONIA | (Tallinn a + Tartu b) | | President Kersti Kaljulaid | | |
| | SPAIN | (Madrid) | | King Philip VI | | |
| | EUROPEAN UNION | (Brussels a + Luxembourg j + Strasbourg l) | | President Ursula von der Leyen | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Sauli Niinisto | | |
| | FRANCE | (Paris) | | President Emmanuel Macron | | |
| | GEORGIA | (Tbilisi a + Batumi d) | | President Salome Zurabishvili | | |
| | GREECE | (Athens a) | | President Ekaterini Sakellaropoulou | | |
| | CROATIA | (Zagreb) | | President Zoran Milanovich | | |
| | HUNGARY | (Budapest a) | | President Janos Ader | | |
| | IRELAND | (Dublin) | | President Michael Daniel Higgins | | |
| | ISRAEL | (Jerusalem aru + Tel Aviv-Jaffa i) | | President Reuven Rivlin | | |
| | IRAN | (Tehran) | | Supreme Leader Ayatollah Ali Khamenei | | |
| | JORDAN | (Amman) | | King Abdullah II | | |
| | JAPAN | (Tokyo) | | Emperor Naruhito | | |
| | KENYA | (Nairobi) | | President Uhuru Kenyatta | | |
| | KYRGYZSTAN | (Bishkek) | | Talant Mamytov | | |
| | CAMBODIA | (Phnom Penh) | | King Norodom Sihamoni | | |
| | SOUTH KOREA | (Seoul adknr + Sejong b) | | President Moon Jae-In | | |
| | KAZAKHSTAN | (Nur-Sultan a) | | President Kasym-Zhomart Tokayev | | |
| | LEBANON | (Beirut a + Baabda r + Hadeth d) | | President Michel Aoun | | |
| | LIECHTENSTEIN | (Vaduz) | | Prince Hans-Adam II | | |
| | LITHUANIA | (Vilnius) | | President Gitanas Nauseda | | |
| | LUXEMBOURG | (Luxembourg a) | | Grand Duke Henri | | |
| | LATVIA | (Riga) | | President Egils Levits | | |
| | MOROCCO | (Rabat a) | | King Muhammad VI | | |
| | MOLDOVA | (Chisinau) | | President Maia Sandu | | |
| | MONTENEGRO | (Podgoritsa a + Cetinje hr) | | President Milo Djukanovich | | |
| | MADAGASCAR | (Tananarive) | | President Andry Rajoelina | | |
| | NORTH MACEDONIA | (Skopje) | | President Stevo Pendarovski | | |
| | MONGOLIA | (Ulan-Bator) | | President Khaltmaagiin Battulga | | |
| | MAURITANIA | (Nouakchott) | | President Mohamed Ould Ghazouani | | |
| | MALTA | (Valletta a + Attard r + Siggiewi s) | | President George Vella | | |
| | NIGER | (Niamey) | | President Mahamadou Issoufou | | |
| | NIGERIA | (Abuja a) | | President Muhammadu Buhari | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | King Willem-Alexander | | |
| | NORWAY | (Oslo) | | King Harald V | | |
| | PHILIPPINES | (Manila acr + Quezon City b + Pasay City b) | | President Rodrigo Duterte | | |
| | PAKISTAN | (Islamabad) | | President Arif Alvi | | |
| | POLAND | (Warsaw a) | | President Andrzej Duda | | |
| | PALESTINE | (Ramallah qr + (East Jerusalem)) | | President Mahmoud Abbas | | |
| | PORTUGAL | (Lisbon) | | President Marcelo Rebelo de Sousa | | |
| | ROMANIA | (Bucharest) | | President Klaus Iohannis | | |
| | SERBIA | (Belgrade) | | President Alexandar Vuchich | | |
| | RWANDA | (Kigali) | | President Paul Kagame | | |
| | SWEDEN | (Stockholm) | | King Charles XVI Gustav | | |
| | SLOVENIA | (Ljubljana) | | President Borut Pahor | | |
| | SLOVAKIA | (Bratislava a + Kosice d) | | President Zuzana Caputova | | |
| | SENEGAL | (Dakar) | | President Macky Sall | | |
| | ESWATINI | (Mbabane aj + Lobamba lr) | | King Mswati III | | |
| | CHAD | (Ndjamena) | | President Idriss Deby Itno | | |
| | TAJIKISTAN | (Dushanbe) | | President Emomali Rakhmonov | | |
| | TURKMENISTAN | (Ashgabat) | | President Arkadag Gurbanguly Berdymukhammedov | | |
| | TURKEY | (Ankara a + Marmaris s) | | President Recep Tayyip Erdogan | | |
| | TANZANIA | (Dodoma City al + Dar Es Salaam jnqr) | | President John Magufuli | | |
| | UKRAINE | (Kiev) | | President Volodymyr Zelensky | | |
| | UGANDA | (Kampala a + Entebbe r) | | President Yoweri Museveni | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | AMERICA | (Washington-District of Columbia) | | President Donald Trump | | |
| | UZBEKISTAN | (Tashkent a) | | Shavkat Mirziyayev | | |
| | WEST AFRICAN STATES | (Abuja) | | President Jean-Claude Kassi Brou (ci) | | |
| | YEMEN | (Riyadh x) | | President Abd Rabbuh Mansur Hadi | | |