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 Alexander Van der Bellen | | |
| | BELGIUM | (Brussels) | | King Philippe | | |
| | BULGARIA | (Sofia) | | President Rumen Radev | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Simonetta Sommaruga | | |
| | 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 | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Sauli Niinisto | | |
| | FRANCE | (Paris) | | President Emmanuel Macron | | |
| | GREECE | (Athens a) | | President Prokopis Pavlopoulos | | |
| | CROATIA | (Zagreb) | | President Kolinda Grabar-Kitarovich | | |
| | HUNGARY | (Budapest a) | | President Janos Ader | | |
| | IRELAND | (Dublin) | | President Michael Daniel Higgins | | |
| | ICELAND | (Reykjavik a + Alftanes r) | | President Gudhni Thorlacius Johannesson | | |
| | ITALY | (Rome a) | | President Sergio Mattarella | | |
| | LITHUANIA | (Vilnius) | | President Gitanas Nauseda | | |
| | LUXEMBOURG | (Luxembourg a) | | Grand Duke Henri | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | King Willem-Alexander | | |
| | NORWAY | (Oslo) | | King Harald V | | |
| | POLAND | (Warsaw a) | | President Andrzej Duda | | |
| | PORTUGAL | (Lisbon) | | President Marcelo Rebelo de Sousa | | |
| | ROMANIA | (Bucharest) | | President Klaus Iohannis | | |
| | SWEDEN | (Stockholm) | | King Charles XVI Gustav | | |
| | SLOVENIA | (Ljubljana) | | President Borut Pahor | | |
| | SLOVAKIA | (Bratislava a + Kosice d) | | President Zuzana Caputova | | |
| | TURKEY | (Ankara a) | | President Recep Tayyip Erdogan | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |