32 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 | | |
| | AFGHANISTAN | (Kabul) | | President Sardar Mohammad Daud Khan | | |
| | BAHRAIN | (Manamah) | | Emir Sheikh Isa II bin Salman Al Khalifah | | |
| | ALGERIA | (Algiers a + El Biar d + El Mouradia r) | | President Houari Boumedienne | | |
| | EGYPT | (Cairo a + Alexandria r) | | President Anwar El-Sadat | | |
| | GUINEA | (Conakry) | | President Ahmed Sekou Toure | | |
| | INDONESIA | (Jakarta a + Bogor r + Chipanas r + Yogyakarta r + Tampaksiring r) | | President Suharto | | |
| | IRAN | (Tehran) | | Mohammad Reza Shah Pahlavi | | |
| | JORDAN | (Amman) | | King Hussein I | | |
| | KUWAIT | (Kuwait City) | | Emir Sheikh Sabah III Al Salim Al Sabah | | |
| | LEBANON | (Beirut a + Baabda r) | | President Suleiman Frangieh | | |
| | LIBYA | (Tripoli a) | | Guide Muammar Gaddafi | | |
| | MOROCCO | (Rabat a) | | King Hassan II | | |
| | MALI | (Bamako) | | President Moussa Traore | | |
| | MAURITANIA | (Nouakchott) | | President Moktar Ould Daddah | | |
| | MALAYSIA | (Kuala Lumpur) | | Sultan Abdul Halim Muadzam Shah | | |
| | NIGER | (Niamey) | | President Hamani Diori | | |
| | OMAN | (Muscat) | | Sultan Qaboos bin Said | | |
| | PAKISTAN | (Islamabad) | | President Zulfikar Ali Bhutto | | |
| | PALESTINE | (Tel Al-Zaatar x) | | Yasser Arafat | | |
| | QATAR | (Doha) | | Emir Sheikh Khalifah bin Hamad Al Thani | | |
| | SAUDI ARABIA | (Riyadh) | | King Faisal | | |
| | SUDAN | (Khartoum) | | President Gaafar Muhammad Numairy | | |
| | SIERRA LEONE | (Freetown) | | President Siaka Stevens | | |
| | SENEGAL | (Dakar) | | President Leopold Sedar Senghor | | |
| | SOMALIA | (Mogadishu) | | President Muhammad Siad Barre | | |
| | SYRIA | (Damascus) | | President Hafez Al-Assad | | |
| | CHAD | (Fort Lamy) | | President Francois Tombalbaye | | |
| | TUNISIA | (Tunis) | | President Habib Bourguiba | | |
| | TURKEY | (Ankara a) | | President Fahri Koruturk | | |
| | SOUTH YEMEN | (Aden) | | President Salem Ali Rubayyi | | |
| | NORTH YEMEN | (Sanaa) | | Abdul Rahman al-Iryani | | |