| Kannonji Castle | |
|---|---|
(観音寺城) | |
| Azuchi, Ōmihachiman, Shiga Japan | |
 ruins of Kannonji Castle | |
  Kannonji Castle  Kannonji Castle | |
| Coordinates | 35°08′46″N 136°09′28″E / 35.146027°N 136.157778°E |
| Type | Mountain castle (山城) |
| Site information | |
| Controlled by | Azuchi, Shiga |
| Open to the public | yes |
| Condition | Ruins |
| Site history | |
| Built | c.1468 |
| Built by | Rokkaku clan |
| In use | 1468 – 1582 |
| Materials | Stone, wood |
| Battles/wars | Onin War |
| Events | Conquered by Oda Nobunaga (1568) |
Kannonji Castle (観音寺城, Kannonji-jō) was a Sengoku period yamashiro-style Japanese castle located in what is now the Azuchi neighborhood of the city of Ōmihachiman, Shiga Prefecture, Japan. The ruins have been protected as a National Historic Site since 1982, with the area under protection expanded in 1984.[1] The castle was named after Kannonshō-ji, a Buddhist temple near the peak of the mountain.