42 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 + Al Karama f) | | President Sheikh Zayed II bin Sultan Al Nahyan | | |
| | AFGHAN MUJAHIDEEN | (Panjshir + Peshawar) | | Ahmad Shah Massoud | | |
| | BENGLADESH | (Dacca a) | | Abdus Sattar | | |
| | UPPER VOLTA | (Ouagadougou) | | President Saye Zerbo | | |
| | BAHRAIN | (Manamah) | | Emir Sheikh Isa II bin Salman Al Khalifah | | |
| | CAMEROON | (Yaounde) | | President Ahmadou Ahidjo | | |
| | JIBUTI | (Jibuti) | | President Hassan Gouled Aptidon | | |
| | ALGERIA | (Algiers a + El Biar d + El Mouradia r) | | President Chadli Bendjedid | | |
| | GABON | (Libreville) | | President Omar Bongo | | |
| | GAMBIA | (Banjul) | | President Sir Dawda Jawara | | |
| | GUINEA | (Conakry) | | President Ahmed Sekou Toure | | |
| | GUINEA-BISSAU | (Bissau) | | President Joao Bernardo Vieira | | |
| | INDONESIA | (Jakarta a + Bogor r + Chipanas r + Yogyakarta r + Tampaksiring r) | | President Suharto | | |
| | IRAQ | (Baghdad) | | President Saddam Hussein al-Tikriti | | |
| | IRAN | (Tehran) | | Supreme Leader Ayatollah Ruhollah Khomeini | | |
| | JORDAN | (Amman) | | King Hussein I | | |
| | COMOROS | (Moroni) | | Ahmed Abdallah | | |
| | KUWAIT | (Kuwait City) | | Emir Sheikh Jabir III Al Ahmad Al Jabir Al Sabah | | |
| | LEBANON | (Beirut-East a + Baabda r) | | President Elias Sarkis | | |
| | LIBYA | (Tripoli a) | | Guide Muammar Gaddafi | | |
| | MOROCCO | (Rabat a) | | King Hassan II | | |
| | MALI | (Bamako) | | President Moussa Traore | | |
| | MAURITANIA | (Nouakchott) | | Colonel Mohamed Khouna Ould Haidallah | | |
| | MALDIVES | (Male) | | President Maumoon Abdul Gayoom | | |
| | MALAYSIA | (Kuala Lumpur) | | Sultan Ahmad Shah | | |
| | NIGER | (Niamey) | | President Seyni Kountche | | |
| | OMAN | (Muscat) | | Sultan Qaboos bin Said | | |
| | PAKISTAN | (Islamabad) | | President Mohammad Zia-ul-Haq | | |
| | PALESTINE | (Tel Al-Zaatar x) | | Yasser Arafat | | |
| | QATAR | (Doha) | | Emir Sheikh Khalifah bin Hamad Al Thani | | |
| | SAUDI ARABIA | (Riyadh) | | King Khalid | | |
| | SUDAN | (Khartoum) | | President Gaafar Muhammad Numairy | | |
| | SIERRA LEONE | (Freetown) | | President Siaka Stevens | | |
| | SENEGAL | (Dakar) | | President Abdou Diouf | | |
| | SOMALIA | (Mogadishu) | | President Muhammad Siad Barre | | |
| | SYRIA | (Damascus) | | President Hafez Al-Assad | | |
| | CHAD | (Ndjamena) | | Gukuni Wodei | | |
| | TUNISIA | (Tunis) | | President Habib Bourguiba | | |
| | TURKEY | (Ankara a) | | Kenan Evren | | |
| | UGANDA | (Kampala a + Entebbe r) | | President Milton Obote | | |
| | SOUTH YEMEN | (Aden) | | Ali Nasir Muhammad Husani | | |
| | NORTH YEMEN | (Sanaa) | | President Ali Abdullah Saleh | | |