22 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. ] :
| | UNITED ARAB EMIRATES | (Abu Dhabi ar) | | President Sheikh Khalifa bin Zayed Al Nahyan | | |
| | AFGHANISTAN | (Kabul) | | President Ashraf Ghani | | |
| | AZERBAIJAN | (Baku) | | President Iham Aliyev | | |
| | CHINA | (Beijing) | | Xi Jinping | | |
| | EGYPT | (Cairo a + Alexandria r) | | President Abdel Fattah el-Sisi | | |
| | ISRAEL | (Jerusalem aru + Tel Aviv-Jaffa i) | | President Reuven Rivlin | | |
| | INDIA | (New Delhi a + Simla s + Bolarum w) | | President Ram Nath Kovind | | |
| | IRAQ | (Baghdad) | | President Fuad Masum | | |
| | IRAN | (Tehran) | | Supreme Leader Ayatollah Ali Khamenei | | |
| | JORDAN | (Amman) | | King Abdullah II | | |
| | KYRGYZSTAN | (Bishkek) | | President Sooronbay Jeenbekov | | |
| | SOUTH KOREA | (Seoul adknr + Sejong b) | | President Moon Jae-In | | |
| | KAZAKHSTAN | (Astana a) | | President Elbashy Nursultan Nazarbayev | | |
| | MONGOLIA | (Ulan-Bator) | | President Khaltmaagiin Battulga | | |
| | PAKISTAN | (Islamabad) | | President Mamnoon Hussain | | |
| | PALESTINE | (Ramallah qr + (East Jerusalem)) | | President Mahmoud Abbas | | |
| | RUSSIA | (Moscow a + Saint Petersburg d) | | President Vladimir Putin | | |
| | THAILAND | (Bangkok) | | King Rama X. Vajiralongkorn | | |
| | TAJIKISTAN | (Dushanbe) | | President Emomali Rakhmonov | | |
| | TURKEY | (Ankara a) | | President Recep Tayyip Erdogan | | |
| | UZBEKISTAN | (Tashkent a) | | Shavkat Mirziyayev | | |
| | VIETNAM | (Hanoi) | | Nguyen Phu Trong | | |