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. ] :
| | AUSTRIA | (Vienna) | | President Alexander Van der Bellen | | |
| | AUSTRALIA | (Canberra) | | David Hurley | | |
| | BANGLADESH | (Dhaka a) | | President Abdul Hamid | | |
| | BELGIUM | (Brussels) | | King Philippe | | |
| | BULGARIA | (Sofia) | | President Rumen Radev | | |
| | BRUNEI DARUSSALAM | (Bandar Seri Begawan) | | Sultan Hassanal Bolkiah | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Simonetta Sommaruga | | |
| | 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 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 | | |
| | GREECE | (Athens a) | | President Ekaterini Sakellaropoulou | | |
| | CROATIA | (Zagreb) | | President Zoran Milanovich | | |
| | HUNGARY | (Budapest a) | | President Janos Ader | | |
| | INDONESIA | (Jakarta a + Bogor r + Chipanas r + Yogyakarta r + Tampaksiring r) | | President Joko Widodo | | |
| | IRELAND | (Dublin) | | President Michael Daniel Higgins | | |
| | INDIA | (New Delhi a + Simla s + Bolarum w) | | President Ram Nath Kovind | | |
| | ITALY | (Rome a) | | President Sergio Mattarella | | |
| | JAPAN | (Tokyo) | | Emperor Naruhito | | |
| | CAMBODIA | (Phnom Penh) | | King Norodom Sihamoni | | |
| | SOUTH KOREA | (Seoul adknr + Sejong b) | | President Moon Jae-In | | |
| | KAZAKHSTAN | (Nur-Sultan a) | | President Kasym-Zhomart Tokayev | | |
| | LAOS | (Vientiane) | | Boungnang Vorachith | | |
| | LITHUANIA | (Vilnius) | | President Gitanas Nauseda | | |
| | LUXEMBOURG | (Luxembourg a) | | Grand Duke Henri | | |
| | LATVIA | (Riga) | | President Egils Levits | | |
| | MYANMAR | (Naypyidaw a + Rangoon bn) | | President Win Myint | | |
| | MONGOLIA | (Ulan-Bator) | | President Khaltmaagiin Battulga | | |
| | MALTA | (Valletta a + Attard r + Siggiewi s) | | President George Vella | | |
| | MALAYSIA | (Putrajaya aj + Kuala Lumpur ejlry) | | Sultan Abdullah Shah | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | King Willem-Alexander | | |
| | NORWAY | (Oslo) | | King Harald V | | |
| | NEW ZEALAND | (Wellington) | | Queen Elizabeth II | | |
| | PHILIPPINES | (Manila acr + Quezon City b + Pasay City b) | | President Rodrigo Duterte | | |
| | PAKISTAN | (Islamabad) | | President Arif Alvi | | |
| | POLAND | (Warsaw a) | | President Andrzej Duda | | |
| | PORTUGAL | (Lisbon) | | President Marcelo Rebelo de Sousa | | |
| | ROMANIA | (Bucharest) | | President Klaus Iohannis | | |
| | RUSSIA | (Moscow a + Saint Petersburg d) | | President Vladimir Putin | | |
| | SWEDEN | (Stockholm) | | King Charles XVI Gustav | | |
| | SINGAPORE | (Singapore) | | President Halimah Yacob | | |
| | SLOVENIA | (Ljubljana) | | President Borut Pahor | | |
| | SLOVAKIA | (Bratislava a + Kosice d) | | President Zuzana Caputova | | |
| | THAILAND | (Bangkok) | | King Rama X. Vajiralongkorn | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | VIETNAM | (Hanoi) | | Nguyen Phu Trong | | |
| | ASEAN | (Jakarta) | | SG Dato Paduka Lim Jock Hoi (bn) | | |