50 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 Hamid Karzai | | |
| | AZERBAIJAN | (Baku) | | President Iham Aliyev | | |
| | BANGLADESH | (Dhaka a) | | President Zillur Rahman | | |
| | BURKINA FASO | (Ouagadougou) | | President Blaise Compaore | | |
| | BAHRAIN | (Manamah) | | King Sheikh Hamad bin Isa Al Khalifah | | |
| | BENIN | (Porto Novo a + Cotonou ilnqr) | | President Yayi Boni | | |
| | BRUNEI DARUSSALAM | (Bandar Seri Begawan) | | Sultan Hassanal Bolkiah | | |
| | COTE D´IVOIRE | (Yamoussoukro a + Abidjan dln) | | President Alassane Ouattara | | |
| | CAMEROON | (Yaounde) | | President Paul Biya | | |
| | DJIBOUTI | (Djibouti) | | President Ismail Omar Guelleh | | |
| | ALGERIA | (Algiers a + El Biar d + El Mouradia r) | | President Abdelaziz Bouteflika | | |
| | EGYPT | (Cairo a + Alexandria r) | | Mohamed Hussein Tantawi | | |
| | GABON | (Libreville) | | President Ali Ben Bongo Ondimba | | |
| | GAMBIA | (Banjul) | | President Yahya Jammeh | | |
| | GUINEA | (Conakry) | | President Alpha Conde | | |
| | GUINEA-BISSAU | (Bissau) | | President Malam Bacai Sanha | | |
| | INDONESIA | (Jakarta a + Bogor r + Chipanas r + Yogyakarta r + Tampaksiring r) | | President Susilo Bambang Yudhoyono | | |
| | IRAQ | (Baghdad) | | President Jalal Talabani | | |
| | IRAN | (Tehran) | | Supreme Leader Ayatollah Ali Khamenei | | |
| | JORDAN | (Amman) | | King Abdullah II | | |
| | KYRGYZSTAN | (Bishkek) | | Roza Otunbayeva | | |
| | COMOROS | (Moroni) | | Ahmed Abdallah Mohamed Sambi | | |
| | KUWAIT | (Kuwait City) | | Emir Sheikh Sabah IV Al Ahmad Al Jabir Al Sabah | | |
| | KAZAKHSTAN | (Astana a) | | President Elbashy Nursultan Nazarbayev | | |
| | LEBANON | (Beirut a + Baabda r + Hadeth d) | | President Michel Suleiman | | |
| | LIBYA | (Tripoli a) | | Guide Muammar Gaddafi | | |
| | MOROCCO | (Rabat a) | | King Muhammad VI | | |
| | MALI | (Bamako) | | President Amadou Toumani Toure | | |
| | MAURITANIA | (Nouakchott) | | President Mohamed Ould Abdelaziz | | |
| | MALDIVES | (Male) | | President Mohamed Nasheed | | |
| | MALAYSIA | (Putrajaya aj + Kuala Lumpur ejlry) | | Sultan Mizan Zainal Abidin | | |
| | NIGER | (Niamey) | | President Mahamadou Issoufou | | |
| | NIGERIA | (Abuja a) | | President Goodluck Jonathan | | |
| | OMAN | (Muscat) | | Sultan Qaboos bin Said | | |
| | PAKISTAN | (Islamabad) | | President Asif Ali Zardari | | |
| | PALESTINE | (Ramallah qr + (East Jerusalem)) | | President Mahmoud Abbas | | |
| | QATAR | (Doha) | | Emir Sheikh Hamad bin Khalifah Al Thani | | |
| | SAUDI ARABIA | (Riyadh) | | King Abdullah | | |
| | SUDAN | (Khartoum) | | President Omar Al-Bashir | | |
| | SIERRA LEONE | (Freetown) | | President Ernest Bai Koroma | | |
| | SENEGAL | (Dakar) | | President Abdoulaye Wade | | |
| | SOMALIA | (Mogadishu-Villa Somalia) | | President Sheikh Sharif Ahmed | | |
| | SURINAME | (Paramaribo) | | President Desi Bouterse | | |
| | SYRIA | (Damascus) | | President Bashar Al-Assad | | |
| | CHAD | (Ndjamena) | | President Idriss Deby Itno | | |
| | TOGO | (Lome) | | President Faure Gnassingbe | | |
| | TAJIKISTAN | (Dushanbe) | | President Emomali Rakhmonov | | |
| | TUNISIA | (Tunis) | | Fuad Mebazaa | | |
| | YEMEN | (Sanaa) | | President Ali Abdullah Saleh | | |