Kawanehon is a town located in Haibara District, Shizuoka Prefecture, Japan. As of 1 August 2019, the town had an estimated population of 6,731 in 2895 households and a population density of 13.4 persons per km². The total area of the town was 496.88 square kilometres (191.85 sq mi).

The Ōigawa Main Line is a Japanese railway line which connects Kanaya Station in Shimada, Shizuoka Prefecture with Senzu Station in Kawanehon, Haibara District, Shizuoka Prefecture. It is owned and operated by the private railway operator Ōigawa Railway.