Kiyoshiki Castle, Medieval mountain castle in Satsumasendai, Japan

Kiyoshiki Castle is a medieval mountain castle (yamajiro) in the Uramyōmyō district of Iriki-chō, Satsumasendai, Kagoshima Prefecture. Its earthworks run along a ridge about 750 m east-west and 600 m north-south behind the hill of the present Iriki branch office, with enclosures named Honmaru, Matsuo-jō, Nishi-no-jō and Naka-no-jō. Between them lie sheer dry moats cut into the Shirasu plateau.

Kiyoshiki Castle was the base of the Iriki-in clan, a powerful local lord of Satsuma Province. Its founding date is unknown, but its original form is thought to have taken shape around the Nanboku-chō period. It was abandoned under the one-castle-per-province edict of the Tokugawa shogunate.

The castle was the base of the Iriki-in clan, a powerful local lord family of Satsuma Province. Its name comes from Kiyoshiki, the place in Iriki-chō Uragami, Satsumasendai, where the ridge-top fort was built. The Iriki-in held it until the one-castle-per-province edict abolished it in the Edo period.

The site lies on the ridge behind the present-day Iriki branch office of Satsumasendai; the castle area stretches about 750 m east-west and 600 m north-south. The baileys are separated by sheer dry moats cut into the Shirasu plateau, so expect steep drops and uneven ground.

The castle's dry moats were cut into the Shirasu plateau, leaving sheer cliff walls between the enclosures; this technique also appears at other medieval castles in Kagoshima Prefecture. The site was designated a National Historic Site on 30 September 2004.