Shoumogu, Shinto shrine in Japan

Shoumogu is a Shinto shrine in Katsumoto, Iki, whose main hall, west gate and south gate are designated tangible cultural properties of Nagasaki Prefecture. The shrine stands on the site where Empress Jingu is said to have landed during the Korean campaign, and its precinct contains a horseshoe stone linked to her horse. The grounds also hold a stone wall built by Kato Kiyomasa's men during the Japanese invasions of Korea.

According to shrine tradition, the site began in 200 when Empress Jingu built a temporary palace at Kazamoto while waiting for wind during the Korean campaign; the name was later changed to Katsumoto. The shrine counts its founding from 717, when a hall was built to pray for the protection of the state. It became one of the seven shrines of Iki and the province's second shrine, and was long linked to Kashii Shrine in Fukuoka.

The shrine's name, Shoumogu, means "Holy Mother Shrine," and its main deity is Empress Jingu, honored for victory in battle and safe childbirth. Its five-day autumn festival is the largest in Iki, featuring the mikoshi boat race that divines the next year's harvest and catch, and on the final day, October 14, the Ogami Kagura dance and a costumed parade.

Shoumogu stands in Katsumotoura, Katsumoto-chō, on the north-west coast of Iki. The nearest bus stop is Nakaori on the Iki Kōtsū Gonoura–Katsumoto line; the shrine is a short walk from Katsumoto harbour, with Katsumoto Castle ruins and Katsumoto Elementary School nearby. The main festival runs five days around 14–15 October, when the harbour festival is held as well, so expect crowds then.

Within the shrine grounds stands a horseshoe stone, said to hold the hoofprint of Empress Jingu's horse from the Korean campaign. The same shore is where Yuan forces landed during the 1274 Bun'ei invasion. Kato Kiyomasa donated the main gate during Toyotomi Hideyoshi's Korean campaigns, and the surrounding stone walls were built by his men while they waited for wind.