Chōnan

right|thumb|270px| Chōnan town hall is a town located in Chiba Prefecture, Japan. , the town had an estimated population of 7,743 in 3240 households and a population density of 120 persons per km2. The total area of the town is .

is a Buddhist temple located in the town of Chōnan, Chiba Prefecture, Japan. It belongs to the Tendai sect and its honzon is a hibutsu statue of Jūichimen Kannon Bosatsu shown to the public in the years of the Ox and Horse in the 12-year cycle of the Chinese zodiac. The temple's full name is Daihi-zan Nankō-in Kasamori-ji (大悲山 楠光院 笠森寺).The temple is the 31st stop on the Bandō Sanjūsankasho pilgrimage route. The temple is also called "Kasamori-dera" using the alternate pronunciation of the Chinese character for temple (tera). It is located within the borders of the Kasamori Tsurumai Prefectural