47 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 | | |
| | BANGLADESH | (Dhaka a) | | President Zillur Rahman | | |
| | BAHRAIN | (Manamah) | | King Sheikh Hamad bin Isa Al Khalifah | | |
| | BRUNEI DARUSSALAM | (Bandar Seri Begawan) | | Sultan Hassanal Bolkiah | | |
| | BOTSWANA | (Gaborone) | | President Seretse Ian Khama | | |
| | CAMEROON | (Yaounde) | | President Paul Biya | | |
| | CHINA | (Beijing) | | Hu Jintao | | |
| | CYPRUS | (Nicosia) | | President Dimitris Christofias | | |
| | EGYPT | (Cairo a + Alexandria r) | | Mohamed Hussein Tantawi | | |
| | GHANA | (Accra) | | President John Atta Mills | | |
| | THE GAMBIA | (Banjul) | | President Yahya Jammeh | | |
| | INDONESIA | (Jakarta a + Bogor r + Chipanas r + Yogyakarta r + Tampaksiring r) | | President Susilo Bambang Yudhoyono | | |
| | INDIA | (New Delhi a + Simla s + Bolarum w) | | President Pratibha Patil | | |
| | IRAQ | (Baghdad) | | President Jalal Talabani | | |
| | IRAN | (Tehran) | | Supreme Leader Ayatollah Ali Khamenei | | |
| | JORDAN | (Amman) | | King Abdullah II | | |
| | JAPAN | (Tokyo) | | Emperor Akihito | | |
| | KENYA | (Nairobi) | | President Emilio Mwai Kibaki | | |
| | NORTH KOREA | (Pyongyang a) | | Kim Jong-Il | | |
| | SOUTH KOREA | (Seoul a + Sejong f) | | President Lee Myung-Bak | | |
| | KUWAIT | (Kuwait City) | | Emir Sheikh Sabah IV Al Ahmad Al Jabir Al Sabah | | |
| | LEBANON | (Beirut a + Baabda r + Hadeth d) | | President Michel Suleiman | | |
| | SRI LANKA | (Sri Jayewardenepura Kotte al + Colombo ejnr + Kandy r) | | President Mahinda Rajapaksa | | |
| | NEW LIBYA | (Benghazi a + Tripoli b) | | Mustafa Abdul-Jaleel | | |
| | MYANMAR | (Naypyidaw a + Rangoon bn) | | President Thein Sein | | |
| | MONGOLIA | (Ulan-Bator) | | President Tsakhiagiin Elbegdorj | | |
| | MAURITIUS | (Port Louis a + Reduit in Moka r) | | President Sir Anerood Jugnauth | | |
| | MALAYSIA | (Putrajaya aj + Kuala Lumpur ejlry) | | Sultan Mizan Zainal Abidin | | |
| | NIGERIA | (Abuja a) | | President Goodluck Jonathan | | |
| | NEPAL | (Kathmandu) | | President Ram Baran Yadav | | |
| | 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 | | |
| | SINGAPORE | (Singapore) | | President Tony Tan Keng Yam | | |
| | SIERRA LEONE | (Freetown) | | President Ernest Bai Koroma | | |
| | SENEGAL | (Dakar) | | President Abdoulaye Wade | | |
| | SOMALIA | (Mogadishu-Villa Somalia) | | President Sheikh Sharif Ahmed | | |
| | SYRIA | (Damascus) | | President Bashar Al-Assad | | |
| | THAILAND | (Bangkok) | | King Rama IX Bhumibol Adulyadej | | |
| | TURKEY | (Ankara a) | | President Abdullah Gul | | |
| | TANZANIA | (Dodoma City al + Dar Es Salaam jnqr) | | President Jakaya Kikwete | | |
| | UGANDA | (Kampala a + Entebbe r) | | President Yoweri Museveni | | |
| | YEMEN | (Sanaa) | | President Ali Abdullah Saleh | | |
| | SOUTH AFRICA | (Pretoria ae + Cape Town l + Bloemfontein j + Johannesburg d) | | President Jacob Zuma | | |