Hinokuma Castle, Ruined Japanese castle in Kizanmachi, Hita, Oita Prefecture, Japan

Hinokuma Castle is a ruined flatland-mountain castle (hirayama-jiro) on a hill in Kizanmachi, Hita, Oita Prefecture, overlooking the Mikuma River. It was built in 1592 by Miyagi Tomoyori and expanded by Mori Takamasa from 1596 with a five-storey keep and a three-storey yagura. Today the site is Kizan Park; only a stone wall said to be the ōte-mon masugata remains.

Hinokuma Castle was built in 1592 by Miyagi Tomoyori, a Toyotomi Hideyoshi retainer, as a hirayama castle above the Mikuma River in Hita. In 1596 Mori Takamasa took it over and added a five-storey keep and a three-storey yagura. The castle was abandoned under the Tokugawa shogunate's one-castle-per-province order of 1616.

The castle's name is also read as Kuma-jō, "the corner castle". When Miyagi Tomoyori built it in 1592, he moved the Sōtō Zen temple Shinkō-ji from the hill to its foot and relocated merchants and a market from Tajima village to the castle town, which grew around present-day Kuma-machi.

The site is now Kizan Park in Hita, Oita Prefecture, on the hill above the Mikuma River. No castle structures survive; only a stone wall said to be the remains of the outer gate masugata can be seen. The hilltop is reached on foot, and the former Honmaru area now holds the Hinokuma Shrine building.

The castle's name is often given as Kuma Castle, and the hill where it stood is now Kizayama Park in Hita. A 1596 inventory of the keep's furnishings, the Tenshu Dogu Okaiwara, survives in Saeki domain records and lists matchlock guns, armour and a tea caddy stored on its five floors.