Ọyọ, usually referred to as Ọyọ State to distinguish it from the city of Ọyọ, is an inland state in southwestern Nigeria. Its capital is Ibadan, the third most populous city in the country and formerly the second most populous city in Africa. Ọyọ State is bordered to the north by Kwara State, to the east by Ọṣun State, and to the southwest by Ogun State and the Republic of Benin. With a projected population of 7,840,864 in 2016, Ọyọ State is the fifth most populous in the Nigeria.