Explanation

Tanku Abdul Rahman of Malaysia was the first Secretary General of the Organisation of Islamic Cooperation (OIC) from 1971 to 1973.

2nd Secretary General: Hassan al-Touhami (1974-1975)

3rd Secretary General: Amadou Karim Gaye (1975-1979)

11th Secretary General: Yousef bin Ahmad Al-Othaimeen (2016-2020)

12th and Current Secretary General: Hissein Brahim Taha (2020-present)