Shousan-ji Temple, Buddhist temple in Kamiyama, Japan.

Shousan-ji is a Shingon temple on the slope of Mount Shousan-ji at about 706 meters, not at the summit. Its main hall has a broad grey tiled roof with upward-curving eaves, carved wooden brackets and lattice windows, and a blue curtain with white crests hangs at the entrance. A weathered wooden gate with a green-tiled roof and a plaque reading '摩盧山' stands on a stone base.

According to temple tradition, En no Gyōja founded the site during the Taihō era (701–704), enshrining Zaō Gongen. In 815 Kūkai is said to have subdued a fire-breathing serpent, sealed it in a cave with the help of Kokūzō Bosatsu, and carved the main image. In the late Kamakura period it became an imperial prayer temple under Emperor Go-Daigo, and later received the patronage of the Ashikaga and Hachisuka families.

The temple's name and mountain name come from the legend of a fire-breathing serpent subdued by Kukai, who sealed it in a cave with the help of Kokuzo Bosatsu. The main image is a wooden Kokuzo Bosatsu statue, 112 cm tall, carved from a single piece of kaya wood. The three-faced Daikoku hall houses a secret image with Daikoku at the center, Bishamonten on the right and Benzaiten on the left; a front-facing three-faced Daikoku is shown to visitors.

The temple stands near the eighth station of Mount Shōsanji, at 706 m, the second-highest temple on the pilgrimage. Walking from Fujii-dera takes six to eight hours over steep trails, so many visitors come by car; the large car park holds 70 vehicles for a 500-yen road management fee. The stamp office is open from 8:00 to 16:30, and one stamp book per person is required.

From the trailhead behind the main hall, a 1.1 km path climbs about an hour to the summit of Mount Shōsanji at 938 m. After 450 m stands the rock said to have sealed the serpent; a fork leads down to Ryūō Cave, while the right branch passes a hokora and a narrow ridge to the Okunoin hall of Zao Gongen. The "me-arai Daishi" sits about 150 m beyond Ryūō Cave.