Ọyọ State is an inland state in south-western Nigeria, with its capital at Ibadan. It is bounded in the north by Kwara State, in the east by Osun State, in the south by Ogun State and in the west partly by Ogun State and partly by the Republic of Benin.

Oyo State covers approximately an area of 28,454 square kilometers and is ranked 14th by size. The landscape consists of old hard rocks and dome shaped hills, which rise gently from about 500 meters in the southern part and reaching a height of about 1,219 metre above sea level in the northern part. Some principal rivers such as Ogun river, Oba, Oyan, Otin, Ofiki, Sasa, Oni, Erinle and Osun river take their sources from this highland.

Oyo State contain a number of natural features including the Old Oyo National Park. In this location there was earlier habitat for the endangered African Wild Dog, Lycaon pictus; however, this canid is thought to have been locally extirpated at the present.

The Climate is equatorial, notably with dry and wet seasons with relatively high humidity. The dry season lasts from November to March while the wet season starts from April and ends in October. Average daily temperature ranges between 25 °C (77.0 °F) and 35 °C (95.0 °F), almost throughout the year.

Abiola Adeyemi Ajimobi (born 16 December 1949) is a Nigerian politician from Oyo State in south-western Nigeria. He was formerly the Managing Director/Chief Executive Officer of the National Oil and Chemical Marketing Company a subsidiary of Shell Petroleum, Nigeria. He left the oil sector in 2002 after 26 years, and was elected in 2003 as a Senator of the Republic of Nigeria representing Oyo South Senatorial District on the platform of the Alliance for Democracy (AD). After one term in the senate, he contested in 2007 for the governorship of Oyo state under the banner of the All Nigeria People's Party (ANPP), a bid which he lost. He recontested again in the April 2011 elections under the Action Congress of Nigeria (ACN) and was elected Governor of Oyo State in a closely contested vote.

Abiola Ajimobi was born on the 16 December 1949 to the Ajimobi of Ibadan at Oja'ba, Ibadan. His was a political family. His grand-father was Sobaloju of Ibadan Land (a chief in the royal court of Ibadan). His uncle, Hon. N.A. Ajimobi was minister of works and transport in the Western Region. His father, Pa Ajimobi, was also an Honourable member of the House of Assembly in the Old Western region. He started his education at Saint Patricks Primary School, Oke-Padre in Ibadan. He completed his primary education at Ibadan City Council Primary School, Aperin. His secondary education was at Lagelu Grammar School. As a high school student he was active in athletics, table tennis, and football including serving as the school's games prefect.

Alhaji Lamidi Ona-Olapo Adesina (born 20 January 1939) is an educator who became governor of Oyo State in Nigeria on 29 May 1999 as a member of the Alliance for Democracy (AD) party.

Adesina was born on 20 January 1939. He attended Loyola college in Ibadan. then studied at the University of Nigeria, Nsukka from 1961-1963. Later he attended the university of Ibadan in 1971. He worked in private educational institutions before entering politics.

Adesina was a sponsor of Abiola Ajimobi in his successful bid to be elected to the senate for Oyo South in 2003. Later the two men fell apart, and Ajimobi moved to the All Nigeria Peoples Party (ANPP), but in October 2009 the two were leaders of the Action Congress (Nigeria) (AC) party in Oyo State, and had reconciled.