Tōun-ji, Buddhist temple in Hatsukaichi, Japan

Tōun-ji is a Sōtō Zen Buddhist temple in the Sagata district of Hatsukaichi, Hiroshima Prefecture, with the mountain name Ōryūzan and Shakyamuni as its principal image. It was founded in 1487 by Kanaoka Yōken, a disciple of Tamesō Chūshin, on the initiative of Fujiwara no Norichika, a priest of Itsukushima Shrine. The temple holds tombs of Ōuchi and Mōri retainers, including Sue Harukata, Tomoda Okifuji, Katsura Motozumi and Mōri Motokiyo.

Tōun-ji was founded in 1487 (Chōkyō 1) by Kanaoka Yōken, with his teacher Isō Chūshin as founding abbot, on the initiative of Fujiwara no Norichika, a priest of Itsukushima Shrine. The Sōtō Zen temple later received protection from the Ōuchi, Sue and Mōri clans. Sue Harutaka, forced to take his own life by the Mōri, was buried here, as were Tomoda Okifuji, Katsura Motozumi and Mōri Motokiyo.

The temple keeps the graves of several Sengoku-period figures:陶晴賢, who took his own life after his defeat by the Mōri, was buried here by the Mōri clan, and the graves of Tomoda Okifuji, Katsura Motozumi and Mōri Motokiyo (Hoida Motokiyo) also stand on the grounds. The graves of 陶晴賢, Mōri Motokiyo and his wife, Katsura Motozumi and Fujiwara Okifuji are city-designated historic sites.

Tōun-ji stands at 1071-1 Sagata, Hatsukaichi, in Hiroshima Prefecture, west of Hiroshima city and near the coast facing Miyajima. The temple belongs to the Sōtō school and is reached from Hatsukaichi Station by local bus; the grave markers of陶晴賢 and other warriors lie within the grounds.

The temple holds the grave of Sue Harutaka, the Ōuchi retainer driven to suicide by the Mōri clan, who then buried him here. Graves of Tomoda Okifuji, Katsura Motozumi and Mōri Motokiyo (Hoida Motokiyo) also stand on the grounds, alongside a wooden staff and clay brick Buddhas designated city cultural properties.