The Organisation of Islamic Cooperation has 57 member states.

Member State	Joined	Notes
Afghanistan	1969	Suspended 1980 - March 1989
Algeria	1969
Chad	1969
Egypt	1969	Suspended May 1979 - March 1984
Guinea	1969
Indonesia	1969
Iran	1969
Jordan	1969
Kuwait	1969
Lebanon	1969
Libya	1969
Malaysia	1969
Mali	1969
Mauritania	1969
Morocco	1969
Niger	1969
Pakistan	1969	Blocking India India India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...  from membership
State of Palestine	1969
Saudi Arabia	1969
Senegal	1969
Sudan	1969
Somalia	1969
Tunisia	1969
Turkey	1969
Yemen	1969	From 1990 as Republic of Yemen united with People's Democratic Republic of Yemen People's Democratic Republic of Yemen The People's Democratic Republic of Yemen — also referred to as South Yemen, Democratic Yemen or Yemen — was a socialist republic in the present-day southern and eastern Provinces of Yemen...
Bahrain	1970
Oman	1970
Qatar	1970
Syria	1970
United Arab Emirates	1970
Sierra Leone	1972
Bangladesh	1974	Pakistan recognized it as 2nd summit's main issue inviting Mujib ur Rehman to Lahore.
Gabon	1974
The Gambia	1974
Guinea-Bissau	1974
Uganda	1974
Burkina Faso	1975
Cameroon	1975
Comoros	1976
Iraq	1976
Maldives	1976
Djibouti	1978
Benin	1982
Brunei	1984
Nigeria	1986
Azerbaijan	1991
Albania	1992
Kyrgyzstan	1992
Tajikistan	1992
Turkmenistan	1992
Mozambique	1994
Kazakhstan	1995
Uzbekistan	1995
Suriname	1996
Togo	1997
Guyana	1998
Côte d'Ivoire	2001
Suspended or Withdrawn
Zanzibar	1993	Withdrew August 1993
Observer States
Bosnia and Herzegovina	1994
Central African Republic	1997
as 'Turkish Cypriot State'	1979	Designation changed in 2004
Thailand	1998
Russia	2005
Observer Muslim Organisations and Communities
Moro National Liberation Front Moro National Liberation Front The Moro National Liberation Front is a political organization that was founded by Nur Misuari in 1969. The MNLF struggles against the Philippine Government to achieve independence of the Bangsamoro Land...	1977	Blocking membership of the Philippines Philippines The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...
Observer Islamic institutions
Parliamentary Union of the OIC Member States Parliamentary Union of the OIC Member States Parliamentary Union of the OIC Member States is composed of parliaments of the Organisation of the Islamic Conference members states...	2000
Islamic Conference Youth Forum for Dialogue and Cooperation	2005
Observer International Organisations
League of Arab States	1975
United Nations United Nations The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...	1976
Non-Aligned Movement Non-Aligned Movement The Non-Aligned Movement is a group of states considering themselves not aligned formally with or against any major power bloc. As of 2011, the movement had 120 members and 17 observer countries...	1977
Organisation of African Unity	1977
Economic Cooperation Organisation	1995

Membership attempts

(since 2002) - India, which has the world's third largest Muslim population

Islam in India

Islam is the second-most practiced religion in the Republic of India after Hinduism, with more than 13.4% of the country's population ....

, has shown an interest in joining the OIC as an observer nation. While India's candidacy is supported by some OIC members including Saudi Arabia, Pakistan's strong opposition and threat to boycott the OIC have led to India's inclusion into the OIC being blocked. The Pakistan Foreign Office argued that India's inclusion in OIC would be against the rules of OIC, which state that an aspirant should not have an ongoing conflict with a member state. (since 2008) - The Philippine government has made attempts to join the OIC, but this is opposed by the Moro National Liberation Front

Moro National Liberation Front

The Moro National Liberation Front is a political organization that was founded by Nur Misuari in 1969. The MNLF struggles against the Philippine Government to achieve independence of the Bangsamoro Land...

, an OIC observer located in the Philippines. The MNLF claims that Philippine membership is unnecessary. In 2009, the country's bid has received stronger support and has been advocated by Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

, Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

, Malaysia, and the United Arab Emirates

United Arab Emirates

The United Arab Emirates, abbreviated as the UAE, or shortened to "the Emirates", is a state situated in the southeast of the Arabian Peninsula in Western Asia on the Persian Gulf, bordering Oman, and Saudi Arabia, and sharing sea borders with Iraq, Kuwait, Bahrain, Qatar, and Iran.The UAE is a...

, among others. (since 2008) (since 2008) (since 2008) (since 2008)