Iseyin is a city located in Oyo state, Nigeria. Iseyin is approximately 100 kilometers north of Ibadan. Iseyin is the fourth largest city in Oyo, after Ibadan, Ogbomoso and Oyo. Iseyin is also known as the Home of Aso Oke. Aso Oke or Ofi is a popular traditional fabric mostly used for ceremonies amongst the Yoruba people of Nigeria. Tobacco is grown in Iseyin, amongst other food and cash crops, it is as a result of this that a big tobacco company, British American Tobacco has a "leave office" in the city. Friesland Campina (Wamco) also has a milk processing center in the city.
Ikere Gorge dam is located in the city, it was said to be the second largest dam when it was discovered alongside Kanji dam, during President Obasanjo's regime (Military). The city has a private Polytechnic named SAF Polytechnic, Iseyin, a Government Technical College and the Oyo state NYSC (National Youth Service Corps) permanent orientation camp. Iseyin also has an ultra modern private Digital Library named Raji Oke-Esa Memorial Library, the Library was commissioned by the Nigeria former president, General(Rtd.) Olusegun Obasanjo.