Château de Kaneko, Mountain castle site in Niihama, Japan

Kaneko Castle is a Sengoku-period mountain castle on the 80-metre summit of Kanekoyama in Niihama, overlooking the alluvial plain of the Kokuryo River. Its steep northern and eastern slopes formed a natural defence; earthworks and baileys remain despite later landscaping for Takinomiya Park.

Kaneko Castle stands on Mount Kaneko in present-day Niihama, Ehime Prefecture. The Kaneko clan, descended from the Murayama branch of the Taira, first appear in records in 1282, when Kaneko Yorihiro held the jitō post of Niiho. In 1338 Kaneko Yasuhiro took Ikushiyama Castle, so Kaneko Castle is thought to have existed by the Nanboku-chō period. It fell in July 1585 to Kobayakawa Takakage's army during Toyotomi Hideyoshi's conquest of Shikoku, ending over 300 years of Kaneko rule, and was never rebuilt.

The castle's name is also written Kanekoyama Castle, and it is alternatively called Kitsu-jo. The Kaneko clan, descended from the Murayama branch of the Taira, took its name from Kaneko village in Iruma district, Musashi province, before settling in Iyo. The site is a Niihama City designated historic site, and the summit now holds an observation deck, a gazebo and playground equipment within Takinomiya Park.

The site is now Takinomiya Park in Niihama, reached on foot up the 80-metre Kanekoyama hill above the left bank of the Kokuryo River. Earthworks from park landscaping have altered much of the terrain, but the baileys and dry moats (horikiri) remain visible. There is an observation deck, a shelter and playground equipment; no castle buildings survive.

Kaneko Castle was never rebuilt after its fall in July 1585, and in the late Showa era a plan to reconstruct it as a city symbol collapsed: the proposed keep followed Edo-period styles unlike the real castle, drawing criticism from historians. The site became a Niihama City designated historic site on 6 April 1978.