List of governors of Osun State

The governor of Osun State is the head of government of Osun State in Nigeria. The governor is the head of the executive branch of the Osun State Government. The governor has a duty to enforce state laws and the power to either approve or veto bills passed by the Osun State House of Assembly, to convene the legislature and grant pardons.

When Osun State was created from Oyo State in 1991, Colonel Leo Segun Ajiborisha was appointed its first governor. Rauf Aregbesola served the longest term as governor, serving for two consecutive terms of 4 years from 2010 to 2018.

Since the creation of the state in 1991, 10 people have served as governor, 4 military governors and 6 civilian governors. Ajiborisha served the shortest term in office of 4 months.

The current governor is Ademola Adeleke, he was sworn in on 27 November 2022.

Military governor (1991–1992)
Osun State was created on 27 August 1991 and General Ibrahim Babangida appointed Leo Segun Ajiborisha as military governor.

Third Republic (1992–1993)
Under the 1979 Constitution, the second constitution of the Federal Republic of Nigeria, the governor was both head of state and government. The governor was elected for a four-year term. In the event of a vacancy the deputy governor would have served as acting governor.

Military administrators (1993–1999)
General Sani Abacha led the palace coup d'ètat of 1993 which overthrew the Third Republic. He appointed his military administrators in December 1993.

Fourth Republic (1999–present)
Under the 1999 Constitution of the Federal Republic of Nigeria, the governor is both head of state and government. The governor is elected for a four-year term. In the event of a vacancy, the deputy governor would serve as acting governor.