Château d'Ishikawajo, Japanese castle in Hirosaki, Japan

Ishikawajo Castle is a former castle site in Hirosaki, Aomori Prefecture, now laid out as Daibutsu Park. Nothing of the fortress stands; the grounds hold the Daibutsu, a large Buddha statue, and traces of the earthworks of the castle and its twelve satellite compounds, the thirteen fortifications known together as Ishikawa Castle.

Ishikawajo was reportedly built in 1334 by Soga Dōsei of Hiraga, head of the Soga main family in Tsugaru. In 1533 Ishikawa Takanobu made it his residence, but on 5 May 1571 Ōura Tamenobu, later Tsugaru Tamenobu, attacked at dawn, took the castle and Takanobu killed himself. It passed to the Tsugaru clan, guarded by Itagaki Masakane, and was abandoned in 1611 when Hirosaki Castle was built.

The site is now Daibutsu Park, named after the Daibutsugahana (Great Buddha's Nose) location of the former castle. The castle was one of the thirteen fortified residences called Ishikawa Jūdate, together with Okadate, Sarugakudate and others. In 2016 Hirosaki created the mascot robot Tamenobūn V, and Ishikawa Castle is its component "Ishī".

The castle no longer stands: its site is now Daibutsu Park in Hirosaki, laid out as open ground rather than a walled compound. Look for the park on the rise at the coordinates 40.54877, 140.54409, and allow time to walk the grounds on foot.

The castle no longer stands: it was abandoned in 1611 when Hirosaki Castle was built, and its site is now Daibutsu Park. The name Ishikawa Castle also covers thirteen satellite forts, the Ishikawa Jūdate, including Okadate, Sarugakudate and Hatadate. In 2016 Hirosaki made the robot Tamenobūn V from five castle robots; Ishikawa Castle is the unit called Ishī.