Kanō Castle, Castle ruins in Gifu, Japan

Kanō Castle is a flatland castle ruin in Gifu, Gifu Prefecture, measuring about 550 m north-to-south and 400 m east-to-west, with a double moat. Its square main enclosure has a protruding outer box, a feature called the Kanō-type castle. Today the site is a park with stone wall fragments, a portion of the moat, and the base of the tenshu.

Saitō Toshinaga built the first Kanō Castle in 1445 as a base for the Toki clan, but it was abandoned by 1538. After the Battle of Sekigaraha in 1600, Tokugawa Ieyasu ordered a new castle on the site; construction ran from 1602 and was completed in 1603, with materials from Gifu Castle. It served as the Kanō Domain's administrative center until 1872, when its buildings were destroyed and moats filled.

Kanō Tenman-gū was built alongside the castle as the Okudaira family's private shrine, then opened to commoners because it stood in the post town of Kanō-juku. The castle town itself lay east of the walls, while Kanō-juku, the 53rd station of the Nakasendō, ran along the north side.

The castle site is a 15-minute walk from Gifu Station on the JR Central Tōkaidō Main Line. The ruins are now a park, with stone walls and a portion of the moat visible; excavated remains were backfilled after investigation. The site is freely accessible.

The tenshu was never built: a three-storey yagura in the northeast corner of the Ni-no-maru served instead, reportedly moved from Gifu Castle. A 1728 lightning fire destroyed it, and it was never rebuilt; the Gifu Local Meteorological Observatory now stands on that spot.