Gesshō-ji, Buddhist temple in Akashi, Japan.

Gesshō-ji is a Sōtō Zen temple in the Hitomaruchō district of Akashi, on a site called Hitomaruyama. Its main hall enshrines an Eleven-Faced Kannon, and its mountain gate is a former medicine gate of Fushimi Castle, moved to Akashi Castle in 1610 and to the temple in 1873. The temple stands beside the Kakinomoto Shrine, with which it once formed a single shrine-temple complex.

Tradition holds that Kūkai founded the temple as Yōryū-ji in 811 on Akashi's Akamatsu-yama, where Akashi Castle's honmaru later stood. In the 880s the priest Kakushō enshrined Kakinomoto no Hitomaro as the tutelary Hitomaru-sha, and the temple took the name Gesshō-ji. Originally Shingon, it became Sōtō Zen in 1575 when the monk Anshitsu arrived. In 1619, when Ogasawara Tadazane built Akashi Castle, the temple and shrine were moved to their present site; in 1744 the mountain name became Hitomaru-san.

The temple and the neighbouring Kakinomoto Shrine were long a single Shinto-Buddhist complex, with Gesshō-ji serving as the shrine's bettō-ji. The Meiji government's 1868 separation order made them separate religious bodies. A circular mound for Kakinomoto no Hitomaro, the poet the shrine honours, remains in Akashi Park.

Gesshō-ji stands at 1-29 Hitomaruchō, Akashi, next to Hitomaru Shrine and the Akashi Municipal Planetarium; Matsuju-in, the Akashi domain lords' family temple, is also nearby. The temple gate is a former Fushimi Castle medicine gate, moved to Akashi Castle in 1610 and to this site in 1873. The circular Hitomaru mound survives in Akashi Park in front of the west corner turret.

The temple's sanmon gate was originally the medicine gate of Fushimi Castle; it was moved to Akashi Castle in 1610 and then relocated to Gesshō-ji in 1873. It is a designated cultural property of Akashi, and a circular tomb mound for Kakinomoto no Hitomaro survives near the west corner turret in Akashi Park.