Oton, officially the Municipality of Oton, is a 1st class municipality in the province of Iloilo, Philippines. According to the 2020 census, it has a population of 98,509 people making it as the most populous town in the province and the entire Panay island. It is the second oldest Spanish settlement in the Philippines after Cebu, founded in 1571. Oton is a part of the Metro Iloilo–Guimaras area, centered on Iloilo City.